<?xml version="1.0" encoding="UTF-8"?>
<!--

Documentation for LCL (Lazarus Component Library) and LazUtils (Lazarus 
Utilities) are published under the Creative Commons Attribution-ShareAlike 4.0 
International public license.

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Copyright (c) 1997-2025, by the Lazarus Development Team.

-->
<fpdoc-descriptions>
<package name="lazutils">
<!--
====================================================================
laz2_xpath
====================================================================
-->
<module name="laz2_xpath">
<short>
An implementation of the XML Path Language (XPath) for Free Pascal.
</short>
<descr>
<p>
<file>laz2_xpath.pas</file> provides an implementation of the XML Path 
Language (XPath) for the Lazarus IDE. It is based on the <file>xpath.pp</file> 
unit from the Free Component Library (FCL).
</p>
<p>
Copyright (c) 2000 - 2003 by Areca Systems GmbH / Sebastian Guenther, 
sg@freepascal.org
</p>
<p>
This implementation is based on the following specification:
</p>
<p>
<url href="https://www.w3.org/TR/1999/REC-xpath-19991116/">
XML Path Language (XPath) Version 1.0,
W3C Recommendation,
16 November 1999
</url>
</p>
<p>
<file>laz2_xpath.pas</file> is part of the <file>LazUtils</file> package.
</p>
</descr>

<!-- unresolved externals -->
<element name="Math"/>
<element name="SysUtils"/>
<element name="Classes"/>
<element name="LazUtilsStrConsts"/>
<element name="Laz2_DOM"/>
<element name="Laz2_XmlUtils"/>

<!-- enumeration type Visibility: default -->
<element name="TXPathToken">
<short>Identifies token types used in XPath expressions.</short>
<descr></descr>
<seealso>
<link id="TXPathScanner"/>
<link id="TXPathKeyword"/>
</seealso>
</element>

<!-- enumeration value Visibility: default -->
<element name="TXPathToken.tkInvalid">
<short>Token is not a valid XPath expression.</short>
</element>
<element name="TXPathToken.tkEndOfStream">
<short>End of the XPath data stream.</short>
</element>
<element name="TXPathToken.tkIdentifier">
<short>Token is a function name.</short>
</element>
<element name="TXPathToken.tkNSNameTest">
<short>Token contains a namespace prefix </short>
</element>
<element name="TXPathToken.tkString">
<short>Token is a string literal.</short>
</element>
<element name="TXPathToken.tkNumber">
<short>Token contains a numeric digit.</short>
</element>
<element name="TXPathToken.tkVariable">
<short>Token is a variable reference.</short>
</element>
<element name="TXPathToken.tkLeftBracket">
<short>Token contains the ( operator.</short>
</element>
<element name="TXPathToken.tkRightBracket">
<short>Token contains the ) operator.</short>
</element>
<element name="TXPathToken.tkAsterisk">
<short>Token contains the * operator.</short>
</element>
<element name="TXPathToken.tkPlus">
<short>Token contains the + operator.</short>
</element>
<element name="TXPathToken.tkComma">
<short>Token contains the , (Comma) expression separator.</short>
</element>
<element name="TXPathToken.tkMinus">
<short>Token contains the - operator.</short>
</element>
<element name="TXPathToken.tkDot">
<short>Token contains a the current node (.) expression </short>
</element>
<element name="TXPathToken.tkDotDot">
<short>Token contains the parent node (..) expression.</short>
</element>
<element name="TXPathToken.tkSlash">
<short>Token contains the / operator.</short>
</element>
<element name="TXPathToken.tkSlashSlash">
<short>Token contains the // operator.</short>
</element>
<element name="TXPathToken.tkColonColon">
<short>Token contains the :: axis operator.</short>
</element>
<element name="TXPathToken.tkLess">
<short>Token contains the LessThan operator.</short>
</element>
<element name="TXPathToken.tkLessEqual">
<short>Token contains the LessThanOrEqual operator.</short>
</element>
<element name="TXPathToken.tkEqual">
<short>Token contains the = operator.</short>
</element>
<element name="TXPathToken.tkNotEqual">
<short>Token contains the != operator.</short>
</element>
<element name="TXPathToken.tkGreater">
<short>Token contains the GreaterThan operator.</short>
</element>
<element name="TXPathToken.tkGreaterEqual">
<short>Token contains the GreaterThanOrEqual operator.</short>
</element>
<element name="TXPathToken.tkAt">
<short>Token contains the @ expression character.</short>
</element>
<element name="TXPathToken.tkLeftSquareBracket">
<short>Token contains the [ expression separator.</short>
</element>
<element name="TXPathToken.tkRightSquareBracket">
<short>Token contains the ] expression separator.</short>
</element>
<element name="TXPathToken.tkPipe">
<short>Token contains the operator | expression character.</short>
</element>

<!-- enumeration type Visibility: default -->
<element name="TXPathKeyword">
<short>
Represents keywords used in XPath syntax.
</short>
<descr>
TXPathKeyword is an enumeration type that represents the axis names, node 
tests, operators, and standard functions available in XPath syntax.
</descr>
<seealso>
<link id="TXPathScanner"/>
<link id="TXPathToken"/>
</seealso>
</element>
<element name="TXPathKeyword.xkNone">
<short>No axis specified.</short>
</element>
<element name="TXPathKeyword.xkAncestor">
<short>Ancestor axis (ancestor::).</short>
</element>
<element name="TXPathKeyword.xkAncestorOrSelf">
<short>Ancestor or Self axis (ancestor-or-self::).</short>
</element>
<element name="TXPathKeyword.xkAttribute">
<short>Attribute axis (attribute::).</short>
</element>
<element name="TXPathKeyword.xkChild">
<short>Child axis (child::).</short>
</element>
<element name="TXPathKeyword.xkDescendant">
<short>Descendant axis (descendant::).</short>
</element>
<element name="TXPathKeyword.xkDescendantOrSelf">
<short>Descendant or Self axis (descendant-or-self::).</short>
</element>
<element name="TXPathKeyword.xkFollowing">
<short>Following axis (following::).</short>
</element>
<element name="TXPathKeyword.xkFollowingSibling">
<short>Following Sibling axis (following-sibling::).</short>
</element>
<element name="TXPathKeyword.xkNamespace">
<short>Namespace axis (namespace::).</short>
</element>
<element name="TXPathKeyword.xkParent">
<short>Parent axis (parent::).</short>
</element>
<element name="TXPathKeyword.xkPreceding">
<short>Preceding axis (preceding::).</short>
</element>
<element name="TXPathKeyword.xkPrecedingSibling">
<short>Preceding Sibling axis (preceding-sibling::).</short>
</element>
<element name="TXPathKeyword.xkSelf">
<short>Self axis (self::).</short>
</element>
<element name="TXPathKeyword.xkComment">
<short>Node test for comment: comment().</short>
</element>
<element name="TXPathKeyword.xkText">
<short>Node test for text: text().</short>
</element>
<element name="TXPathKeyword.xkProcessingInstruction">
<short>Node test for preceding instruction: processing-instruction().</short>
</element>
<element name="TXPathKeyword.xkNode">
<short>Node test for a node: node().</short>
</element>
<element name="TXPathKeyword.xkAnd">
<short>And operator.</short>
</element>
<element name="TXPathKeyword.xkOr">
<short>Or operator.</short>
</element>
<element name="TXPathKeyword.xkDiv">
<short>Div operator.</short>
</element>
<element name="TXPathKeyword.xkMod">
<short>Mod operator.</short>
</element>
<element name="TXPathKeyword.xkLast">
<short>Node set function last().</short>
</element>
<element name="TXPathKeyword.xkPosition">
<short>Node set function position().</short>
</element>
<element name="TXPathKeyword.xkCount">
<short>Node set function Count(node-set).</short>
</element>
<element name="TXPathKeyword.xkId">
<short>Unique ID function: id("foo").</short>
</element>
<element name="TXPathKeyword.xkLocalName">
<short>Node set function local-name(node-set).</short>
</element>
<element name="TXPathKeyword.xkNamespaceUri">
<short>Node set function namespace-uri(node-set).</short>
</element>
<element name="TXPathKeyword.xkName">
<short>Node set function name(node-set).</short>
</element>
<element name="TXPathKeyword.xkString">
<short>String function string(object).</short>
</element>
<element name="TXPathKeyword.xkConcat">
<short>String function concat(string, string).</short>
</element>
<element name="TXPathKeyword.xkStartsWith">
<short>String function starts-with(string, string).</short>
</element>
<element name="TXPathKeyword.xkContains">
<short>String function contains(string, string).</short>
</element>
<element name="TXPathKeyword.xkSubstringBefore">
<short>String function substring-before(string, string).</short>
</element>
<element name="TXPathKeyword.xkSubstringAfter">
<short>String function substring-after(string, string).</short>
</element>
<element name="TXPathKeyword.xkSubstring">
<short>String function substring(string, number, number).</short>
</element>
<element name="TXPathKeyword.xkStringLength">
<short>String function string-length(string).</short>
</element>
<element name="TXPathKeyword.xkNormalizeSpace">
<short>String function normalize-space(string).</short>
</element>
<element name="TXPathKeyword.xkTranslate">
<short>String function translate(string, string, string).</short>
</element>
<element name="TXPathKeyword.xkBoolean">
<short>Boolean function boolean(object).</short>
</element>
<element name="TXPathKeyword.xkNot">
<short>Boolean function not(boolean).</short>
</element>
<element name="TXPathKeyword.xkTrue">
<short>Boolean function true().</short>
</element>
<element name="TXPathKeyword.xkFalse">
<short>Boolean function false().</short>
</element>
<element name="TXPathKeyword.xkLang">
<short>Boolean function lang(string).</short>
</element>
<element name="TXPathKeyword.xkNumber">
<short>Number function number(object).</short>
</element>
<element name="TXPathKeyword.xkSum">
<short>Number function sum(node-set).</short>
</element>
<element name="TXPathKeyword.xkFloor">
<short>Number function floor(number).</short>
</element>
<element name="TXPathKeyword.xkCeiling">
<short>Number function ceiling(number).</short>
</element>
<element name="TXPathKeyword.xkRound">
<short>Number function round(number).</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathExprNode">
<short>
Defines the base class used to evaluate XPath expressions.
</short>
<descr>
<p>
<var>TXPathExprNode</var> is a class used to evaluate an XPath expression. 
XPath expressions are evaluated relative to a context node, and the XPath 
environment. The XPath environment may contain variable bindings, the XPath 
core functions, and other functions loaded from other namespaces.
</p>
<p>
TXPathExprNode provides the abstract Evaluate method which is used to perform 
XPath expression evaluation. It must be re-implemented in descendent classes 
which provide support for specific expression types that can occur in XPath 
syntax.
</p>
</descr>
<seealso></seealso>
</element>

<!-- function Visibility: protected -->
<element name="TXPathExprNode.EvalPredicate">
<short>Evaluates an XPath Predicate Expression.</short>
<descr>
<p>
EvalPredicate is a Boolean function used to evaluate an XPath Predicate 
Expression. EvalPredicate calls the Evaluate method using the specified 
Content node and Environment. An Expression that evaluates to a numeric value 
is considered to be True when the result matches the ContextPosition in the 
AContext argument.
</p>
<p>
EvalPredicate is used in the implementation of other specialized Predicate 
Expressions types descended from TXPathExprNode.
</p>
</descr>
<seealso></seealso>
</element>
<element name="TXPathExprNode.EvalPredicate.Result">
<short>Boolean result for the evaluated expression.</short>
</element>
<element name="TXPathExprNode.EvalPredicate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathExprNode.EvalPredicate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<element name="TXPathExprNode.Evaluate">
<short>
Specifies the method used to evaluate an XPath Predicate Expression.
</short>
<descr>
<p>
<var>Evaluate</var> is an abstract virtual <var>TXPathVariable</var> function 
which specifies the interface used to evaluate an XPath Predicate Expression. 
Evaluate must be implemented in descendent classes which handles specific 
Predicate Expression types in the XPath syntax.
</p>
</descr>
<seealso>
<link id="TXPathVariable"/>
</seealso>
</element>
<element name="TXPathExprNode.Evaluate.Result">
<short>Contains the result for the evaluated expression.</short>
</element>
<element name="TXPathExprNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathExprNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- array type Visibility: default -->
<element name="TXPathNodeArray">
<short>Array used to store TXPathExprNode entries.</short>
<descr>
<p>
<var>TXPathNodeArray</var> is an array of <var>TXPathExprNode</var> type. It 
is used to store XPath predicate expressions passed as arguments to 
<var>TXPathExprNode</var> descendants or <var>TXPathScanner</var>.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
<link id="TXPathScanner"/>
</seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathConstantNode">
<short>Represents an XPath literal expression.</short>
<descr>
<p>
<var>TXPathConstantNode</var> is a <var>TXPathExprNode</var> descendant that 
represents an XPath predicate expression which contains a literal value (any 
value surrounded by Quotation Marks). The return value is the 
<var>TXPathVariable</var> passed to the constructor for the class instance.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
<link id="TXPathVariable"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathConstantNode.FValue"/>

<!-- constructor Visibility: public -->
<element name="TXPathConstantNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathConstantNode.Create.AValue">
<short>XPath variable with the value for the literal expression.</short>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathConstantNode.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathConstantNode.Evaluate">
<short>
Returns the value for the constant node and increments its reference count.
</short>
<descr>
<p>
The context node and the XPath environment arguments are not used in the 
method.
</p>
</descr>
<seealso></seealso>
</element>
<element name="TXPathConstantNode.Evaluate.Result">
<short>Value for the constant node.</short>
</element>
<element name="TXPathConstantNode.Evaluate.AContext">
<short>Context node for the evaluation.</short>
</element>
<element name="TXPathConstantNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathVariableNode">
<short>Represents an XPath variable expression.</short>
<descr>
<p>
<var>TXPathVariableNode</var> is a <var>TXPathExprNode</var> descendant that 
represents an XPath Variable Reference expression in the XPath syntax. For 
example:
</p>
<code>&#36;prefix:varname</code>
<p>
TXPathVariableNode provides an overridden Evaluate method that is used to get 
the value for the node from the variable bindings in the XPath environment.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
<link id="TXPathEnvironment"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathVariableNode.FName"/>

<!-- constructor Visibility: public -->
<element name="TXPathVariableNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariableNode.Create.AName">
<short>Name for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathVariableNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr>
<p>
<var>Evaluate</var> is an overridden method used to evaluate the XPath 
expression and return its derived value. Evaluate implements the abstract 
method defined in the ancestor class.
</p>
<p>
For TXPathVariableNode, Evaluate uses the XPath environment passed in the 
AEnvironment argument to retrieve the value for the variable. If a variable 
is not found with the required name in the XPath environment, the 
EvaluationError method is called to raise an exception with the message in 
lrsEvalUnknownVariable.
</p>
</descr>
<errors>
<p>
Raises an exception (in EvaluationError) when the variable name does not 
exist in the XPath environment. Raised with the exception message in 
lrsEvalUnknownVariable.
</p>
</errors>
<seealso>
<link id="EvaluationError"/>
</seealso>
</element>
<element name="TXPathVariableNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathVariableNode.Evaluate.AContext">
<short>Context node for the function.</short>
</element>
<element name="TXPathVariableNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathFunctionNode">
<short>Represents an XPath Function expression.</short>
<descr>
<p>
TXPathFunctionNode is a TXPathExprNode descendant that represents a Function 
Name expression in the XPath syntax. For example:
</p>
<code>local-name() or ms:utc()</code>
<p>
TXPathFunctionNode provides an overridden Evaluate method which is used to 
access the named function in the XPath environment with the arguments found 
in the expression. TXPathFunctionNode provides private members that are used 
to store the name for the function and its optional arguments.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
<link id="TXPathEnvironment"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathFunctionNode.FName"/>
<element name="TXPathFunctionNode.FArgs"/>

<!-- constructor Visibility: public -->
<element name="TXPathFunctionNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathFunctionNode.Create.AName">
<short>Name of the XPath function represented by the class instance.</short>
</element>
<element name="TXPathFunctionNode.Create.Args">
<short>
TXPathNodeArray instance with the arguments passed to the function.
</short>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathFunctionNode.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathFunctionNode.Evaluate">
<short>
Evaluates the XPath function name using the specified context and environment.
</short>
<descr>
<p>
<var>Evaluate</var> is an overridden <var>TXPathVariable</var> function that 
implements the method defined in the ancestor class. Evaluate is used to 
derive the value for the function call using any arguments found in the XPath 
expression, and to store the result in the TXPathVariable return value.
</p>
<p>
Evaluate uses the <var>AEnvironment</var> parameter to access the function 
names (and their implementations) available in the XPath environment. If a 
function with the required name is not found in AEnvironment, the 
<var>EvaluationError</var> routine is called to raise an exception with the 
message in <var>lrsEvalUnknownFunction</var>.
</p>
<p>
Evaluate creates an internal <var>TXPathVarList</var> instance that is used 
to store the value for any arguments in the XPath expression. The list, and 
the context node in <var>AContext</var>, are passed to the function call. The 
internal list is freed prior to exiting from the method.
</p>
</descr>
<seealso>
<link id="TXPathVariable"/>
<link id="TXPathContext"/>
<link id="TXPathEnvironment"/>
<link id="TXPathFunction"/>
<link id="TXPathVarList"/>
</seealso>
</element>
<element name="TXPathFunctionNode.Evaluate.Result">
<short>Result for the evaluated function.</short>
</element>
<element name="TXPathFunctionNode.Evaluate.AContext">
<short>Context node for the evaluation.</short>
</element>
<element name="TXPathFunctionNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathNegationNode">
<short>Represents an XPath Negation expression.</short>
<descr>
<p>
<var>TXPathNegationNode</var> is a <var>TXPathExprNode</var> descendant used 
to represent a Unary Expression with a Negation literal in the XPath syntax. 
For example:
</p>
<code>-&#36;varname</code>
<p>
TXPathNegationNode provides an overridden Evaluate method used to derive the 
return value for the expression.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathNegationNode.FOperand"/>

<!-- constructor Visibility: public -->
<element name="TXPathNegationNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNegationNode.Create.AOperand">
<short>Operand in the XPath expression.</short>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathNegationNode.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathNegationNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr>
<p>
<var>Evaluate</var> is an overridden <var>TXPathVariable</var> function used 
to get the derived value for the XPath expression. Evaluate implements the 
abstract method defined in the ancestor class.
</p>
<p>
Evaluate uses the value in the AContext and AEnvironment parameters to 
calculate the numeric value for the expression.
</p>
</descr>
<seealso>
<link id="TXPathVariable"/>
<link id="TXPathContext"/>
<link id="TXPathEnvironment"/>
</seealso>
</element>
<element name="TXPathNegationNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathNegationNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathNegationNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathBinaryNode">
<short>
The base class for XPath expressions which represent Binary operations.
</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: protected -->
<element name="TXPathBinaryNode.FOperand1"/>
<element name="TXPathBinaryNode.FOperand2"/>

<!-- destructor Visibility: public -->
<element name="TXPathBinaryNode.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- enumeration type Visibility: default -->
<element name="TXPathMathOp">
<short>Identifies the binary Math Operators used in XPath expressions.</short>
<descr>
<p>
Used in the implementation of the TXPathMathOpNode class.
</p>
</descr>
<seealso>
<link id="TXPathMathOpNode"/>
</seealso>
</element>
<element name="TXPathMathOp.opAdd">
<short>The Addition (+) operator.</short>
</element>
<element name="TXPathMathOp.opSubtract">
<short>The Subtraction (-) operator.</short>
</element>
<element name="TXPathMathOp.opMultiply">
<short>The Multiplication (*) operator.</short>
</element>
<element name="TXPathMathOp.opDivide">
<short>The Division (/) operator.</short>
</element>
<element name="TXPathMathOp.opMod">
<short>The Modulus (mod) operator.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathMathOpNode">
<short>Represents a Math Operation in an XPath expression.</short>
<descr>
<p>
<var>TXPathMathOpNode</var> is a <var>TXPathBinaryNode</var> descendant used 
to represent a math operation in an XPath expression. TXPathMathOpNode is 
used for the Additive and Multiplicative Expressions defined in the XPath 
specification. The constructor accepts the operator and the operands from the 
expression. TXPathMathOpNode provides an overridden Evaluate method used to 
derive the value for the XPath expression.
</p>
</descr>
<seealso>
<link id="TXPathBinaryNode"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathMathOpNode.FOperator"/>

<!-- constructor Visibility: public -->
<element name="TXPathMathOpNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathMathOpNode.Create.AOperator">
<short>Math operator used in the XPath expression.</short>
</element>
<element name="TXPathMathOpNode.Create.AOperand1">
<short>Left hand Operand.</short>
</element>
<element name="TXPathMathOpNode.Create.AOperand2">
<short>Right hand Operand.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathMathOpNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathMathOpNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathMathOpNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathMathOpNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- enumeration type Visibility: default -->
<element name="TXPathCompareOp">
<short>Identifies Comparison operators used in an XPath expression.</short>
<descr>
<p>
Used in the implementation of the TXPathCompareNode class.
</p>
</descr>
<seealso>
<link id="TXPathCompareNode"/>
</seealso>
</element>
<element name="TXPathCompareOp.opEqual">
<short>The Equality (=) operator.</short>
</element>
<element name="TXPathCompareOp.opNotEqual">
<short>The Inequality (!=) operator.</short>
</element>
<element name="TXPathCompareOp.opLess">
<short>The Less Than (&lt;) operator.</short>
</element>
<element name="TXPathCompareOp.opLessEqual">
<short>The Less Than Or Equal (&lt;=) operator.</short>
</element>
<element name="TXPathCompareOp.opGreater">
<short>The Greater Than (&gt;) operator.</short>
</element>
<element name="TXPathCompareOp.opGreaterEqual">
<short>The Greater Than Or Equal (&gt;=) operator.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathCompareNode">
<short>Represents an XPath Comparison expression.</short>
<descr>
<p>
TXPathCompareNode is a TXPathBinaryNode descendant used to represent Equality 
or Relational expressions in the XPath syntax.
</p>
<p>
TXPathCompareNode contains an overridden constructor used to specify the 
operator and operands for the comparison expression. TXPathCompareNode 
provides an overridden Evaluate method which compares the nodes or node sets 
for the XPath expression.
</p>
</descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathCompareNode.FOperator"/>

<!-- constructor Visibility: public -->
<element name="TXPathCompareNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathCompareNode.Create.AOperator">
<short>Operator for the comparison.</short>
</element>
<element name="TXPathCompareNode.Create.AOperand1">
<short>Left hand Operand.</short>
</element>
<element name="TXPathCompareNode.Create.AOperand2">
<short>Right hand Operand.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathCompareNode.Evaluate">
<short>Evaluate the XPath Comparison expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathCompareNode.Evaluate.Result">
<short>Result for the comparison.</short>
</element>
<element name="TXPathCompareNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathCompareNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- enumeration type Visibility: default -->
<element name="TXPathBooleanOp">
<short>Represents Boolean operators in an XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- enumeration value Visibility: default -->
<element name="TXPathBooleanOp.opOr">
<short>The OR operator.</short>
</element>
<element name="TXPathBooleanOp.opAnd">
<short>The AND operator.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathBooleanOpNode">
<short>Represents a Boolean expression in XPath syntax.</short>
<descr>
<p>
<var>TXPathBooleanOpNode</var> is a <var>TXPathBinaryNode</var> descendant 
used to represent an And or Or expression in XPath syntax. 
TXPathBooleanOpNode provides an overridden constructor that specifies the 
operator and operands for the XPath expression. TXPathBooleanOpNode contains 
an overridden Evaluate method which performs the comparison using Boolean 
short-circuit logic; i. e. the second operand is ignored if the result can be 
determined using the first operand.
</p>
</descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathBooleanOpNode.FOperator"/>

<!-- constructor Visibility: public -->
<element name="TXPathBooleanOpNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanOpNode.Create.AOperator">
<short>Operator for the Boolean expression.</short>
</element>
<element name="TXPathBooleanOpNode.Create.AOperand1">
<short>Left hand operand.</short>
</element>
<element name="TXPathBooleanOpNode.Create.AOperand2">
<short>Right hand operand.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathBooleanOpNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanOpNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathBooleanOpNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathBooleanOpNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathUnionNode">
<short>Represents a Union Expression node.</short>
<descr>
<p>
<var>TXPathUnionNode</var> is a <var>TXPathBinaryNode</var> descendant used 
to represent a Union expression in the XPath syntax. For example:
</p>
<code>./child::*|./attribute::*</code>
<p>
TXPathUnionNode provides a constructor used to set the operands for the Union 
expression. An overridden Evaluate method is provided to evaluate node sets 
generated for the XPath expression. It ensures that the selected node sets 
for each operand are in document order.
</p>
</descr>
<seealso></seealso>
</element>

<!-- constructor Visibility: public -->
<element name="TXPathUnionNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathUnionNode.Create.AOperand1">
<short>Left hand operand.</short>
</element>
<element name="TXPathUnionNode.Create.AOperand2">
<short>Right hand operand.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathUnionNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathUnionNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathUnionNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathUnionNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TNodeSet">
<short>Implements an XPath Node Set.</short>
<descr>
<p>
<var>TNodeSet</var> is a class alias used to implement a Node Set as defined 
in the XPath specification. TNodeSet is an alias for the TFPList class.
</p>
</descr>
<seealso></seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathFilterNode">
<short>Implements an XPath Filter expression.</short>
<descr>
<p>
<var>TXPathFilterNode</var> is a <var>TXPathExprNode</var> descendant used to 
implement a Filter expression in the XPath syntax. For example:
</p>
<code>//book[@*]</code>
<p>
TXPathFilterNode allows a node set to be filtered to ensure that only values 
matching the XPath expression are included in the result. An overridden 
Evaluate method is provided to generate the node set in the return value, and 
to apply predicates in the XPath expression.
</p>
</descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathFilterNode.FLeft"/>
<element name="TXPathFilterNode.FPredicates"/>

<!-- procedure Visibility: private -->
<element name="TXPathFilterNode.ApplyPredicates">
<short>Applies Predicates to the XPath Node Set.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- argument Visibility: default -->
<element name="TXPathFilterNode.ApplyPredicates.Nodes">
<short>Node Set used as the context nodes for predicate expressions.</short>
</element>

<!-- argument Visibility: default -->
<element name="TXPathFilterNode.ApplyPredicates.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- constructor Visibility: public -->
<element name="TXPathFilterNode.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathFilterNode.Create.AExpr">
<short>XPath Expression to use in the class instance.</short>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathFilterNode.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathFilterNode.Evaluate">
<short>Evaluates the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathFilterNode.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TXPathFilterNode.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TXPathFilterNode.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- enumeration type Visibility: default -->
<element name="TAxis">
<short>Identifies an XPath Axis used in an XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TAxis.axisInvalid">
<short>An invalid Axis name in the XPath syntax.</short>
</element>
<element name="TAxis.axisAncestor">
<short>The ancestor:: Axis.</short>
</element>
<element name="TAxis.axisAncestorOrSelf">
<short>The ancestor-or-self:: Axis.</short>
</element>
<element name="TAxis.axisAttribute">
<short>The attribute:: Axis.</short>
</element>
<element name="TAxis.axisChild">
<short>The child:: Axis.</short>
</element>
<element name="TAxis.axisDescendant">
<short>The descendant:: Axis.</short>
</element>
<element name="TAxis.axisDescendantOrSelf">
<short>The descendant-or-self:: Axis.</short>
</element>
<element name="TAxis.axisFollowing">
<short>The following:: Axis.</short>
</element>
<element name="TAxis.axisFollowingSibling">
<short>The following-sibling:: Axis.</short>
</element>
<element name="TAxis.axisNamespace">
<short>The namespace:: Axis.</short>
</element>
<element name="TAxis.axisParent">
<short>The parent:: Axis.</short>
</element>
<element name="TAxis.axisPreceding">
<short>The preceding:: Axis.</short>
</element>
<element name="TAxis.axisPrecedingSibling">
<short>The preceding-sibling:: Axis.</short>
</element>
<element name="TAxis.axisSelf">
<short>The self:: Axis.</short>
</element>
<element name="TAxis.axisRoot">
<short>The root:: Axis.</short>
</element>

<!-- enumeration type Visibility: default -->
<element name="TNodeTestType">
<short>Represents XPath Node Test types.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- enumeration value Visibility: default -->
<element name="TNodeTestType.ntAnyPrincipal">
<short>The Any Principal Node Test type.</short>
</element>
<element name="TNodeTestType.ntName">
<short>The Name Node Test type.</short>
</element>
<element name="TNodeTestType.ntTextNode">
<short>The Text Node Test type.</short>
</element>
<element name="TNodeTestType.ntCommentNode">
<short>The Comment Node Test type.</short>
</element>
<element name="TNodeTestType.ntPINode">
<short>The Processing Instruction Node Test type.</short>
</element>
<element name="TNodeTestType.ntAnyNode">
<short>The Any Node Test type.</short>
</element>

<!-- class Visibility: default -->
<element name="TStep">
<short>Implements an XPath Location Step.</short>
<descr>
<p>
<var>TStep</var> is a <var>TXPathFilterNode</var> descendant used to 
implement a Location Step expression in the XPath syntax. A location step 
expression contains an Axis name, a node test, and optional predicates that 
determine the items available in a node set. For example:
</p>
<code>./child::book[@lang='en']</code>
<p>
Use the constructor to specify the Axis and Node Test for the XPath 
expression. An overridden Evaluate method is provided to select the nodes 
included in the node set returned by the method.
</p>
</descr>
<seealso></seealso>
</element>

<!-- procedure Visibility: private -->
<element name="TStep.SelectNodes">
<short>Builds the Node Set for the XPath Location Step.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TStep.SelectNodes.ANode">
<short>Context node for the Location Step.</short>
</element>
<element name="TStep.SelectNodes.ResultNodes">
<short>Node Set for the evaluated expression.</short>
</element>

<!-- variable Visibility: public -->
<element name="TStep.Axis">
<short>Axis type for the Location Step.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TStep.NodeTestType">
<short>Node Test Type for the Location Step.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TStep.NodeTestString">
<short>Node Test Type as a String value.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TStep.NSTestString">
<short>Namespace Test as a String value.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- constructor Visibility: public -->
<element name="TStep.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TStep.Create.aAxis">
<short>Axis type to use for the Location Step.</short>
</element>
<element name="TStep.Create.aTest">
<short>Node Test Type to use for the Location Step.</short>
</element>

<!-- function Visibility: public -->
<element name="TStep.Evaluate">
<short>Evaluates the XPath expression for the Location Step.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TStep.Evaluate.Result">
<short>Result for the evaluated expression.</short>
</element>
<element name="TStep.Evaluate.AContext">
<short>Context node for the expression.</short>
</element>
<element name="TStep.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- class Visibility: default -->
<element name="EXPathEvaluationError">
<short>
Exception raised when an error occurs during XPath expression evaluation.
</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- procedure Visibility: default -->
<element name="EvaluationError">
<short>
Raises an exception during expression evaluation with the specified error 
message.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="EvaluationError.Msg">
<short>Message for the evaluation error.</short>
</element>
<element name="EvaluationError.Args">
<short>Arguments used to format the message for the evaluation error.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathVariable">
<short>Base class used to represent an XPath variables and results.</short>
<descr>
<p>
<var>TXPathVariable</var> is a class used to represent Variables and Results 
for an XPath expression. TXPathVariable is a base class, and contains 
abstract methods which must be implemented in descendent classes for the Node 
Set, String, Number, and Boolean data types allowed in XPath variables and 
results.
</p>
<p>
TXPathVariable is used as the return type for the Evaluate method in 
TXPathExprNode and descendent classes. It is also used as the return value 
for Functions implemented in TXPathEnvironment.
</p>
</descr>
<seealso></seealso>
</element>

<!-- variable Visibility: protected -->
<element name="TXPathVariable.FRefCount"/>

<!-- procedure Visibility: protected -->
<element name="TXPathVariable.Error">
<short>Raises an exception with the specified message and arguments.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.Error.Msg">
<short>Message for the error.</short>
</element>
<element name="TXPathVariable.Error.Args">
<short>Arguments used to format the message for the error.</short>
</element>

<!-- class function Visibility: default -->
<element name="TXPathVariable.TypeName">
<short>Gets the Type name for the XPath variable class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.TypeName.Result">
<short>Value for TypeName.</short>
</element>

<!-- procedure Visibility: public -->
<element name="TXPathVariable.Release">
<short>Decrements the reference count for the variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathVariable.AsNodeSet">
<short>Gets the XPath variable as a node set.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.AsNodeSet.Result">
<short>Value for the variable as a Node Set.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathVariable.AsBoolean">
<short>Gets the XPath variable as a Boolean value.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.AsBoolean.Result">
<short>Value for the variable as a Boolean data type.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathVariable.AsNumber">
<short>Gets the XPath variable as a Numeric value.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.AsNumber.Result">
<short>Value for the variable as a Numeric data type.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathVariable.AsText">
<short>Gets the XPath variable as a String value.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathVariable.AsText.Result">
<short>Value for the variable as a String data type.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathNodeSetVariable">
<short>Represents an XPath Node Set variable.</short>
<descr>
<p>
<var>TXPathNodeSetVariable</var> is a <var>TXPathVariable</var> used to 
represent a Node Set variable. TXPathNodeSetVariable implements the abstract 
methods defined in the ancestor class, and contains an internal TNodeSet 
member used to store the nodes in the node set.
</p>
<p>
Use the Value property to access the XPath variable as a TNodeSet class 
instance. Use AsText, AsNumber, or AsBoolean to access the value for the 
variable using the corresponding data type.
</p>
</descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathNodeSetVariable.FValue"/>

<!-- constructor Visibility: public -->
<element name="TXPathNodeSetVariable.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.Create.AValue">
<short>Value for the Node Set variable.</short>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathNodeSetVariable.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- class function Visibility: default -->
<element name="TXPathNodeSetVariable.TypeName">
<short>Gets the Type Name for the variable class.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.TypeName.Result">
<short>Value for the Node Type name.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNodeSetVariable.AsNodeSet">
<short>Gets the Node Set in its native format.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.AsNodeSet.Result">
<short>Value for the Node Set variable as a Node Set type.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNodeSetVariable.AsText">
<short>Gets the Node Set as a String value.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.AsText.Result">
<short>Value for the Node Set variable as a String data type.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNodeSetVariable.AsBoolean">
<short>Gets the Node Set as a Boolean value.</short>
<descr>
The return value is True when the Count property for the mode set is not 0.
</descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.AsBoolean.Result">
<short>Value for the Node Set variable as a Boolean data type.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNodeSetVariable.AsNumber">
<short>Gets the Node Set as a Numeric value.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNodeSetVariable.AsNumber.Result">
<short>Value for the Node Set variable as a Numeric data type.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathNodeSetVariable.Value">
<short>Value for the Node Set variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathBooleanVariable">
<short>Represents an XPath Boolean variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathBooleanVariable.FValue"/>

<!-- constructor Visibility: public -->
<element name="TXPathBooleanVariable.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanVariable.Create.AValue">
<short>Initial value for the variable.</short>
</element>

<!-- class function Visibility: default -->
<element name="TXPathBooleanVariable.TypeName">
<short>Gets the value for TypeName.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanVariable.TypeName.Result">
<short>The value for TypeName.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathBooleanVariable.AsBoolean">
<short>Gets the value for the Boolean variable as a Boolean data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanVariable.AsBoolean.Result">
<short>Boolean value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathBooleanVariable.AsNumber">
<short>Gets the value for the Boolean variable as a Numeric data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanVariable.AsNumber.Result">
<short>Numeric value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathBooleanVariable.AsText">
<short>Gets the value for the Boolean variable as a String data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathBooleanVariable.AsText.Result">
<short>String value for the variable.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathBooleanVariable.Value">
<short>Value for the Boolean variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathNumberVariable">
<short>Represents an XPath Number variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathNumberVariable.FValue"/>

<!-- constructor Visibility: public -->
<element name="TXPathNumberVariable.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNumberVariable.Create.AValue">
<short>Initial value for the variable.</short>
</element>

<!-- class function Visibility: default -->
<element name="TXPathNumberVariable.TypeName">
<short>Type Name for the variable.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNumberVariable.TypeName.Result">
<short>Value for TypeName.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNumberVariable.AsBoolean">
<short>Gets the value for the Numeric variable as a Boolean data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNumberVariable.AsBoolean.Result">
<short>Boolean value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNumberVariable.AsNumber">
<short>Gets the value for the Numeric variable as a Numeric data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNumberVariable.AsNumber.Result">
<short>Numeric value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathNumberVariable.AsText">
<short>Gets the value for the Numeric variable as a String data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNumberVariable.AsText.Result">
<short>String value for the variable.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathNumberVariable.Value">
<short>Value for the Numeric variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathStringVariable">
<short>Represents an XPath String variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathStringVariable.FValue"/>

<!-- constructor Visibility: public -->
<element name="TXPathStringVariable.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathStringVariable.Create.AValue">
<short>Initial value for the variable.</short>
</element>

<!-- class function Visibility: default -->
<element name="TXPathStringVariable.TypeName">
<short>Gets the Type Name for the variable.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathStringVariable.TypeName.Result">
<short>Value for TypeName.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathStringVariable.AsBoolean">
<short>Gets the value for the variable as a Boolean data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathStringVariable.AsBoolean.Result">
<short>Boolean value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathStringVariable.AsNumber">
<short>Gets the value for the variable as a Numeric data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathStringVariable.AsNumber.Result">
<short>Numeric value for the variable.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathStringVariable.AsText">
<short>Gets the value for the variable as a String data type.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathStringVariable.AsText.Result">
<short>String value for the variable.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathStringVariable.Value">
<short>Value for the variable.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- alias type Visibility: default -->
<element name="TXPathNSResolver">
<short>Implements a Namespace resolver for the XPath environment.</short>
<descr>
<p>
<var>TXPathNSResolver</var> is a class used to implement a Namespace resolver 
for the XPath environment. TXPathNSResolver performs namespace look-ups for 
Qualified Names which include a prefix. Namespaces are resolved relative to 
the context node passed to the constructor for the class instance.
</p>
<p>
TXPathNSResolver is used in the implementation of TXPathScanner, 
TXPathExpression, and passed as an argument to the EvaluateXPathExpression 
routine.
</p>
</descr>
<seealso>
<link id="TXPathScanner"/>
<link id="TXPathExpression"/>
<link id="EvaluateXPathExpression"/>
</seealso>
</element>

<element name="TXPathNSResolver.FNode"/>

<element name="TXPathNSResolver.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathNSResolver.Create.aNode">
<short>Context node for the Namespace Resolver.</short>
</element>

<element name="TXPathNSResolver.LookupNamespaceURI">
<short>Gets the Namespace URI with the specified Prefix.</short>
<descr>
Namespace prefixes and URI are resolved relative to the context node for the 
resolver.
</descr>
<seealso></seealso>
</element>
<element name="TXPathNSResolver.LookupNamespaceURI.Result">
<short>Namespace URI for the specified Prefix.</short>
</element>
<element name="TXPathNSResolver.LookupNamespaceURI.aPrefix">
<short>
Prefix to locate in the Namespace information for the Context node.
</short>
</element>

<element name="TXPathScanner">
<short>
Implements a lexical scanner and parser using XPath syntax and semantics.
</short>
<descr>
<p>
<var>TXPathScanner</var> is a class which implements a lexical scanner/parser 
using the syntax and semantics defined in XPath (XML Path Language). 
TXPathScanner provides methods used to tokenize and parse the XPath 
Expression types defined in the specification, at:
</p>
<p>
<url href="https://www.w3.org/TR/1999/REC-xpath-19991116/">
XML Path Language (XPath) Version 1.0  W3C Recommendation 16 November 1999
</url>
</p>
<p>
TXPathScanner examines an XPath expression, and creates a parse tree 
representing the lexical and syntactic elements found in the expression. The 
parse tree consists of TXPathExprNode (and descendent) class instances which 
evaluate the XPath expressions and generate the result(s).
</p>
<p>
TXPathScanner is used in the implementation of the TXPathExpression class and 
the EvaluateXPathExpression routine.
</p>
</descr>
<seealso>
<link id="TXPathExprNode"/>
<link id="TXPathExpression"/>
<link id="EvaluateXPathExpression"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathScanner.FExpressionString"/>
<element name="TXPathScanner.FCurData"/>
<element name="TXPathScanner.FCurToken"/>
<element name="TXPathScanner.FCurTokenString"/>
<element name="TXPathScanner.FTokenStart"/>
<element name="TXPathScanner.FTokenLength"/>
<element name="TXPathScanner.FPrefixLength"/>
<element name="TXPathScanner.FTokenId"/>
<element name="TXPathScanner.FResolver"/>

<element name="TXPathScanner.Error">
<short>Raises an exception with the specified message.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.Error.Msg">
<short>Message for the error.</short>
</element>

<element name="TXPathScanner.ParsePredicates">
<short>Parses XPath Predicate expressions.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParsePredicates.Dest">
<short>Destination nodes for XPath predicates in the expression.</short>
</element>

<element name="TXPathScanner.ParseStep">
<short>Parses XPath Location Steps in the expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseStep.Result">
<short>TStep class instance for the Location Step.</short>
</element>

<element name="TXPathScanner.ParseNodeTest">
<short>
Parses XPath Node Tests to determine the principal node type for the 
expression.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseNodeTest.Result">
<short>TStep class instance for the Location Step.</short>
</element>
<element name="TXPathScanner.ParseNodeTest.axis">
<short>Axis to use for the Location Step in the result value.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParsePrimaryExpr">
<short>Parses a Primary Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParsePrimaryExpr.Result">
<short>Primary expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseFunctionCall">
<short>Parses a FunctionCall Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseFunctionCall.Result">
<short>Function call parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseUnionExpr">
<short>Parses a Union Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseUnionExpr.Result">
<short>Union expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParsePathExpr">
<short>Parses a Path Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParsePathExpr.Result">
<short>Path expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseFilterExpr">
<short>Parses a Filter Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseFilterExpr.Result">
<short>Filter expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseOrExpr">
<short>Parses an Or expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseOrExpr.Result">
<short>Or expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseAndExpr">
<short>Parses an And Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseAndExpr.Result">
<short>And expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseEqualityExpr">
<short>Parses an Equality Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseEqualityExpr.Result">
<short>Equality expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseRelationalExpr">
<short>Parses a Relational Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseRelationalExpr.Result">
<short>Relational expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseAdditiveExpr">
<short>Parses an Additive Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseAdditiveExpr.Result">
<short>Additive expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseMultiplicativeExpr">
<short>Parses a Multiplicative Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseMultiplicativeExpr.Result">
<short>Multiplicative expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ParseUnaryExpr">
<short>Parses an Unary Expression in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ParseUnaryExpr.Result">
<short>Unary expression parsed in the method.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.GetToken">
<short>Gets a lexical token in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.GetToken.Result">
<short>Lexical token read in the scanner.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathScanner.ScanQName">
<short>Locates a Qualified Name in a token.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.ScanQName.Result">
<short>False if the token does not contain a valid QName.</short>
</element>

<!-- constructor Visibility: public -->
<element name="TXPathScanner.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.Create.AExpressionString">
<short>XPath expression examined in the scanner/parser.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathScanner.NextToken">
<short>Gets the next token in the XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.NextToken.Result">
<short>Token kind located in the method.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathScanner.PeekToken">
<short>Peeks at the token kind for the next lexical element.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.PeekToken.Result">
<short>Value for the pending logical token in the scanner.</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathScanner.SkipToken">
<short>Skips the current token when it is not an error.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathScanner.SkipToken.Result">
<short>True if the current token is the same as the tok argument.</short>
</element>
<element name="TXPathScanner.SkipToken.tok">
<short>Token expected in the method.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathScanner.CurToken">
<short>Current token kind in the lexical analysis.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- property Visibility: public -->
<element name="TXPathScanner.CurTokenString">
<short>Current token value in the lexical analysis.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- class Visibility: default -->
<element name="TXPathContext">
<short>Represents the Context for an XPath expression.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TXPathContext.ContextNode">
<short>The node for the XPath context.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TXPathContext.ContextPosition">
<short>The position in the context node.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- variable Visibility: public -->
<element name="TXPathContext.ContextSize">
<short>The size (or length) of the context node set.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- constructor Visibility: public -->
<element name="TXPathContext.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathContext.Create.AContextNode">
<short>Context node for the expression.</short>
</element>
<element name="TXPathContext.Create.AContextPosition">
<short>Position in the context node.</short>
</element>
<element name="TXPathContext.Create.AContextSize">
<short>Size (or length) of the context node set.</short>
</element>

<!-- alias type Visibility: default -->
<element name="TXPathVarList">
<short>List used to store XPath variables in the XPath environment.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function type Visibility: default -->
<element name="TXPathFunction">
<short>Implements an XPath function.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathFunction.Result">
<short>XPath variable returned from the XPath function implementation.</short>
</element>
<element name="TXPathFunction.Context">
<short>Context node for the expression.</short>
</element>
<element name="TXPathFunction.Args">
<short>Arguments for the function.</short>
</element>

<!-- class Visibility: default -->
<element name="TXPathEnvironment">
<short>
Provides access to functions and variables available in the XPath environment.
</short>
<descr>
<p>
<var>TXPathEnvironment</var> is a class which provides access to the core 
function library and variable bindings available for use in an XPath context. 
TXPathEnvironment is not an interface that is directly mandated in the XPath 
specification, but the functionality it provides is required for any XPath 
Context node.
</p>
<p>
TXPathEnvironment provides methods used to add or remove Functions or 
Variables in the XPath environment. Properties are provided to access 
Functions and Variables by their name or their ordinal position. The 
Functions property is pre-populated with the Core Function Library described 
in the XPath specification.
</p>
</descr>
<seealso>
<link id="TXPathFunction"/>
<link id="TXPathVariable"/>
</seealso>
</element>

<!-- variable Visibility: private -->
<element name="TXPathEnvironment.FFunctions"/>
<element name="TXPathEnvironment.FVariables"/>

<!-- function Visibility: private -->
<element name="TXPathEnvironment.GetFunctionCount">
<short>Gets the value for the FunctionCount property.</short>
<seealso>
<link id="#lazutils.laz2_xpath.TXPathEnvironment.FunctionCount">TXPathEnvironment.FunctionCount</link>
</seealso>
</element>
<element name="TXPathEnvironment.GetFunctionCount.Result">
<short>Value for the FunctionCount property.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathEnvironment.GetVariableCount">
<short>Gets the value for the VariableCount property.</short>
<seealso>
<link id="#lazutils.laz2_xpath.TXPathEnvironment.VariableCount">TXPathEnvironment.VariableCount</link>
</seealso>
</element>
<element name="TXPathEnvironment.GetVariableCount.Result">
<short>Value for the VariableCount property.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathEnvironment.GetFunction">
<short>Gets the Function with the specified Name or ordinal position.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.GetFunction.Result">
<short>XPath function with the specified name or ordinal position.</short>
</element>
<element name="TXPathEnvironment.GetFunction.Index">
<short>Ordinal position for the requested function.</short>
</element>
<element name="TXPathEnvironment.GetFunction.AName">
<short>Name for the requested function.</short>
</element>

<!-- function Visibility: private -->
<element name="TXPathEnvironment.GetVariable">
<short>Gets the variable with the specified name or ordinal position.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.GetVariable.Result">
<short>XPath variable with the specified name or ordinal position.</short>
</element>
<element name="TXPathEnvironment.GetVariable.Index">
<short>Ordinal position for the requested variable.</short>
</element>
<element name="TXPathEnvironment.GetVariable.AName">
<short>Name for the requested variable.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpLast">
<short>
Implements the last() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpLast.Result">
<short>Variable returned by the XPath function.</short>
</element>

<!-- argument Visibility: default -->
<element name="TXPathEnvironment.xpLast.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpLast.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpPosition">
<short>
Implements the position() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpPosition.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpPosition.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpPosition.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpCount">
<short>
Implements the count() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpCount.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpCount.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpCount.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpId">
<short>
Implements the id() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpId.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpId.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpId.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpLocalName">
<short>
Implements the local-name() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpLocalName.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpLocalName.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpLocalName.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpNamespaceURI">
<short>
Implements the namespace-uri() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpNamespaceURI.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpNamespaceURI.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpNamespaceURI.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpName">
<short>
Implements the name() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpName.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpName.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpName.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpString">
<short>
Implements the string() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpString.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpString.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpString.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpConcat">
<short>
Implements the concat() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpConcat.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpConcat.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpConcat.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpStartsWith">
<short>
Implements the starts-with() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpStartsWith.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpStartsWith.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpStartsWith.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpContains">
<short>
Implements the contains() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpContains.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpContains.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpContains.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpSubstringBefore">
<short>
Implements the substring-before() function from the XPath Core Function 
Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpSubstringBefore.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpSubstringBefore.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpSubstringBefore.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpSubstringAfter">
<short>
Implements the substring-after() function from the XPath Core Function 
Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpSubstringAfter.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpSubstringAfter.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpSubstringAfter.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpSubstring">
<short>
Implements the substring() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpSubstring.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpSubstring.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpSubstring.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpStringLength">
<short>
Implements the string-length() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpStringLength.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpStringLength.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpStringLength.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpNormalizeSpace">
<short>
Implements the normalize-space() function from the XPath Core Function 
Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpNormalizeSpace.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpNormalizeSpace.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpNormalizeSpace.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpTranslate">
<short>
Implements the translate() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpTranslate.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpTranslate.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpTranslate.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpBoolean">
<short>
Implements the boolean() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpBoolean.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpBoolean.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpBoolean.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpNot">
<short>
Implements the not() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpNot.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpNot.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpNot.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpTrue">
<short>
Implements the true() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpTrue.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpTrue.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpTrue.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpFalse">
<short>
Implements the false() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpFalse.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpFalse.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpFalse.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpLang">
<short>
Implements the lang() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpLang.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpLang.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpLang.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpNumber">
<short>
Implements the number() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpNumber.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpNumber.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpNumber.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpSum">
<short>
Implements the sum() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpSum.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpSum.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpSum.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpFloor">
<short>
Implements the floor() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpFloor.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpFloor.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpFloor.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpCeiling">
<short>
Implements the ceiling() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpCeiling.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpCeiling.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpCeiling.Args">
<short>Arguments for the function.</short>
</element>

<!-- function Visibility: protected -->
<element name="TXPathEnvironment.xpRound">
<short>
Implements the round() function from the XPath Core Function Library.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.xpRound.Result">
<short>Variable returned by the XPath function.</short>
</element>
<element name="TXPathEnvironment.xpRound.Context">
<short>Context node for the function.</short>
</element>
<element name="TXPathEnvironment.xpRound.Args">
<short>Arguments for the function.</short>
</element>

<!-- constructor Visibility: public -->
<element name="TXPathEnvironment.Create">
<short>Constructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- destructor Visibility: public -->
<element name="TXPathEnvironment.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- function Visibility: public -->
<element name="TXPathEnvironment.GetFunctionIndex">
<short>
Gets the ordinal position of the XPath function with the specified name.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.GetFunctionIndex.Result">
<short>
Ordinal position of the XPath function with the specified name.
</short>
</element>
<element name="TXPathEnvironment.GetFunctionIndex.AName">
<short>
Name of the XPath function to locate in the Functions property.
</short>
</element>

<!-- function Visibility: public -->
<element name="TXPathEnvironment.GetVariableIndex">
<short>
Gets the ordinal position of the variable with the specified name.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.GetVariableIndex.Result">
<short>
Ordinal position of the variable with the specified name.
</short>
</element>
<element name="TXPathEnvironment.GetVariableIndex.AName">
<short>
Name of the variable to locate in the Variables property.
</short>
</element>

<!-- procedure Visibility: public -->
<element name="TXPathEnvironment.AddFunction">
<short>
Adds a function to the Functions property with the specified name.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.AddFunction.AName">
<short>
Name for the function added to the Functions property.
</short>
</element>
<element name="TXPathEnvironment.AddFunction.AFunction">
<short>
Function implementation to use for the specified function name.
</short>
</element>

<!-- procedure Visibility: public -->
<element name="TXPathEnvironment.AddVariable">
<short>
Adds a variable with the given name and value to the Variables property.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.AddVariable.AName">
<short>
Name of the variable added in the method.
</short>
</element>
<element name="TXPathEnvironment.AddVariable.AVariable">
<short>
Value for the variable added in the method.
</short>
</element>

<!-- procedure Visibility: public -->
<element name="TXPathEnvironment.RemoveFunction">
<short>
Removes a function with the specified name or ordinal position from the 
Functions property.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.RemoveFunction.Index">
<short>
Ordinal position for the Function with the specified name.
</short>
</element>
<element name="TXPathEnvironment.RemoveFunction.AName">
<short>
Name of the function to remove from the Functions property.
</short>
</element>

<!-- procedure Visibility: public -->
<element name="TXPathEnvironment.RemoveVariable">
<short>Removes a variable with the specified name or ordinal position.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.RemoveVariable.Index">
<short>
Ordinal position for the variable to remove from the XPath environment.
</short>
</element>
<element name="TXPathEnvironment.RemoveVariable.AName">
<short>
Name of the variable to remove from the XPath environment.
</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathEnvironment.FunctionCount">
<short>
Indicates the number of XPath functions in the XPath environment.
</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- property Visibility: public -->
<element name="TXPathEnvironment.VariableCount">
<short>
Indicates the number of variables defined in the XPath environment.
</short>
<descr></descr>
<seealso></seealso>
</element>

<!-- property Visibility: public -->
<element name="TXPathEnvironment.Functions">
<short>Provides indexed access to XPath functions in the environment.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.Functions.Index">
<short>Ordinal position for the requested XPath function.</short>
</element>

<element name="TXPathEnvironment.FunctionsByName">
<short>Gets an XPath function with the specified name.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.FunctionsByName.AName">
<short>Name for the requested XPath function.</short>
</element>

<!-- property Visibility: public -->
<element name="TXPathEnvironment.Variables">
<short>
Provides indexed access to XPath variables in the XPath environment.
</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.Variables.Index">
<short>Ordinal position for the requested variable.</short>
</element>

<element name="TXPathEnvironment.VariablesByName">
<short>Gets an XPath variable with the specified name.</short>
<descr></descr>
<seealso></seealso>
</element>
<element name="TXPathEnvironment.VariablesByName.AName">
<short>Name of the requested variable.</short>
</element>

<element name="TXPathExpression">
<short>
Evaluates an XPath expression using the specified scanner and resolver.
</short>
<descr>
<p>
<var>TXPathExpression</var> is a class used to evaluate an XML XPath 
expression provided to an XPath scanner. It contains methods used to evaluate 
the expression in the scanner and return a TXPathVariable with the node(s) or 
value(s) which match the expression.
</p>
<p>
TXPathExpression instances are created and used in the EvaluateXPathExpression 
routine.
</p>
</descr>
<seealso>
<link id="TXPathExpression.Evaluate"/>
<link id="TXPathScanner"/>
<link id="TXPathNSResolver"/>
<link id="TXPathVariable"/>
<link id="EvaluateXPathExpression"/>
</seealso>
</element>

<element name="TXPathExpression.FRootNode"/>

<element name="TXPathExpression.Create">
<short>Constructor for the class instance.</short>
<descr>
<p>
Create is the constructor for the class instance, and calls the inherited 
method on entry. Create uses AResolver as the value for the Resolver property 
in AScanner. It also updates the internal root node for the expression 
retrieved by calling the ParseOrExpr method in AScanner.
</p>
<p>
Create raises an EXPathEvaluationError exception if the scanner contains 
unused token after evaluating the XPath expression and the CompleteExpression 
argument is set to True.
</p>
</descr>
<seealso></seealso>
</element>
<element name="TXPathExpression.Create.AScanner">
<short>Lexical scanner/parser used to evaluate the expression.</short>
</element>
<element name="TXPathExpression.Create.CompleteExpression">
<short>The XPath expression evaluated in the class instance.</short>
</element>
<element name="TXPathExpression.Create.AResolver">
<short>Namespace resolver used to evaluate the expression.</short>
</element>

<element name="TXPathExpression.Destroy">
<short>Destructor for the class instance.</short>
<descr></descr>
<seealso></seealso>
</element>

<element name="TXPathExpression.Evaluate">
<short>
Evaluates an XPath expression using the scanner for the class instance with 
the specified context node and XPath environment.
</short>
<descr>
<p>
<var>Evaluate</var> is an overloaded method in TXPathExpression used to select 
node(s) or value(s) in the specified context which match an XPath expression. 
It returns a TXPathVariable type which contains the node(s) or value(s) which 
match the expression used in the XPath scanner for the class instance.
</p>
<p>
An overloaded variant allows the XPath environment to be provided during 
expression evaluation. The TXPathEnvironment argument allows variable names, 
variable values, and functions to be added to or removed from the execution 
environment. It also provides an implementation of the core functions in the 
XPath function library.
</p>
<p>
Evaluate iteratively calls the Evaluate method for nodes in the root context 
to capture the return value for the method.
</p>
<p>
No actions are performed in the method if a root node has not been assigned in 
the XPath scanner. In this situation, the return value is <b>Nil</b>.
</p>
</descr>
<seealso>
<link id="TXPathEnvironment"/>
<link id="TXPathScanner"/>
<link id="TXPathVariable"/>
<link id="TXPathExprNode.Evaluate"/>
</seealso>
</element>
<element name="TXPathExpression.Evaluate.Result">
<short>Value from the evaluated expression.</short>
</element>
<element name="TXPathExpression.Evaluate.AContextNode">
<short>Context node for the expression.</short>
</element>
<element name="TXPathExpression.Evaluate.AEnvironment">
<short>XPath environment for the evaluation.</short>
</element>

<!-- function Visibility: default -->
<element name="EvaluateXPathExpression">
<short>
Evaluates an XPath expression using the specified context node and optional 
namespace resolver.
</short>
<descr>
<p>
<var>EvaluateXPathExpression</var> is a <var>TXPathVariable</var> function 
used to locate and return a node or tree of nodes that match the XPath 
expression specified in <var>AExpressionString</var>. AExpressionString is 
similar to a SQL query, and is used to navigate and select DOM nodes found in 
the <var>AContextNode</var> argument.
</p>
<p>
Some examples (for specific xml document content) include:
</p>
<code>
/bookstore/book
/bookstore/book[1]
/bookstore/book[last()]
/bookstore/book[price&lt;35.00]/title
//title[@lang]
//title[@lang="en"]
//title[starts-with(text(),"Introduction to")]
//book[@genre="Science Fiction"]
//*[contains(@class, "nav")]
</code>
<p>
XPath expressions and syntax are defined in the specification located at:
</p>
<p>
<url href="https://www.w3.org/TR/1999/REC-xpath-19991116/">
XML Path Language (XPath) Version 1.0,
W3C Recommendation,
16 November 1999
</url>
</p>
<p>
AContextNode is a DOM node in an existing XML document, and provides the node 
tree searched in the routine. It may be be the root element in an XML 
document, but may also contain one the child nodes in a document to perform a 
limited search.
</p>
<p>
<var>AResolver</var> is a <var>TXPathNSResolver</var> instance which allows 
namespace prefixes and URLs to be validated while evaluating the XPath 
expression. It is an optional argument (the default value is Nil), and when 
omitted causes only the namespaces defined in AContextNode to be considered 
valid. The resolver instance must be created (when needed) using a DOM node 
which contains the namespace declarations for node prefixes that can be 
included in the XPath expression, and the nodes in the result set.
</p>
<p>
EvaluateXPathExpression creates a <var>TXPathScanner</var> instance used to 
parse and process the XPath expression, and to compare DOM nodes for 
inclusion in a result set. It is passed as an argument a 
<var>TXPathExpression</var> instance also created in the routine, and used to 
build the DOM tree that is the return value for the function. The evaluator 
is configured to perform a complete evaluation of the XPath expression, 
including phrases which are non-deterministic. It also returns the 
<var>TXPathVariable</var> instance with the DOM node(s) which match the 
evaluated expression.
</p>
<p>
The TXPathVariable return value may be cast to a type expected in the 
application using methods like <var>AsNodeSet</var>, <var>AsBoolean</var>, or 
<var>AsText</var>. It may also be cast to a specific class type like 
<var>TXPathNodeSetVariable</var>, <var>TXPathBooleanVariable</var>, 
<var>TXPathNumberVariable</var>, or <var>TXPathStringVariable</var>.
</p>
</descr>
<seealso>
<link id="TXPathExpression.Evaluate"/>
<link id="TXPathScanner"/>
<link id="TXPathNSResolver"/>
<link id="TXPathVariable"/>
<link id="TXPathNodeSetVariable"/>
<link id="TXPathBooleanVariable"/>
<link id="TXPathNumberVariable"/>
<link id="TXPathStringVariable"/>
<link id="#lazutils.laz2_dom.TDomNode">TDomNode</link>
</seealso>
</element>
<element name="EvaluateXPathExpression.Result">
<short>XPath variable representing the evaluated XPath expression.</short>
</element>
<element name="EvaluateXPathExpression.AExpressionString">
<short>XPath expression evaluated in the routine.</short>
</element>
<element name="EvaluateXPathExpression.AContextNode">
<short>Context node for the XPath expression.</short>
</element>
<element name="EvaluateXPathExpression.AResolver">
<short>Namespace resolver for the evaluation.</short>
</element>

</module>
<!-- laz2_xpath -->

</package>
</fpdoc-descriptions>
