Laz2_XPath unit

An implementation of the XML Path Language (XPath) for Free Pascal.

laz2_xpath.pas provides an implementation of the XML Path Language (XPath) for the Lazarus IDE. It is based on the xpath.pp unit from the Free Component Library (FCL).

This implementation is based on the following specification:

XML Path Language (XPath) Version 1.0, W3C Recommendation, 16 November 1999

laz2_xpath.pas is part of the LazUtils package.

Classes and records

`EXPathEvaluationError`	class	Exception raised when an error occurs during XPath expression evaluation.
`TStep`	class	Implements an XPath Location Step.
`TXPathBinaryNode`	class	The base class for XPath expressions which represent Binary operations.
`TXPathBooleanOpNode`	class	Represents a Boolean expression in XPath syntax.
`TXPathBooleanVariable`	class	Represents an XPath Boolean variable.
`TXPathCompareNode`	class	Represents an XPath Comparison expression.
`TXPathConstantNode`	class	Represents an XPath literal expression.
`TXPathContext`	class	Represents the Context for an XPath expression.
`TXPathEnvironment`	class	Provides access to functions and variables available in the XPath environment.
`TXPathExpression`	class	Evaluates an XPath expression using the specified scanner and resolver.
`TXPathExprNode`	class	Defines the base class used to evaluate XPath expressions.
`TXPathFilterNode`	class	Implements an XPath Filter expression.
`TXPathFunctionNode`	class	Represents an XPath Function expression.
`TXPathMathOpNode`	class	Represents a Math Operation in an XPath expression.
`TXPathNegationNode`	class	Represents an XPath Negation expression.
`TXPathNodeSetVariable`	class	Represents an XPath Node Set variable.
`TXPathNSResolver`	class	Implements a Namespace resolver for the XPath environment.
`TXPathNumberVariable`	class	Represents an XPath Number variable.
`TXPathScanner`	class	Implements a lexical scanner and parser using XPath syntax and semantics.
`TXPathStringVariable`	class	Represents an XPath String variable.
`TXPathUnionNode`	class	Represents a Union Expression node.
`TXPathVariable`	class	Base class used to represent an XPath variables and results.
`TXPathVariableNode`	class	Represents an XPath variable expression.

Procedures and functions

`EvaluateXPathExpression`	function	Evaluates an XPath expression using the specified context node and optional namespace resolver.
`EvaluationError`	procedure	Raises an exception during expression evaluation with the specified error message.

Types

`TAxis`	enumeration	Identifies an XPath Axis used in an XPath expression.
`TNodeSet`	type	Implements an XPath Node Set.
`TNodeTestType`	enumeration	Represents XPath Node Test types.
`TXPathBooleanOp`	enumeration	Represents Boolean operators in an XPath expression.
`TXPathCompareOp`	enumeration	Identifies Comparison operators used in an XPath expression.
`TXPathFunction`	procedure type	Implements an XPath function.
`TXPathKeyword`	enumeration	Represents keywords used in XPath syntax.
`TXPathMathOp`	enumeration	Identifies the binary Math Operators used in XPath expressions.
`TXPathNodeArray`	type	Array used to store TXPathExprNode entries.
`TXPathToken`	enumeration	Identifies token types used in XPath expressions.
`TXPathVarList`	type	List used to store XPath variables in the XPath environment.

Uses

An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.