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When the evaluation of a kind of expression is described, it will always be explicitly stated if the context node, context position, and context size change for the evaluation of subexpressions; if nothing is said about the context node, context position, and context size, they remain unchanged for the evaluation of subexpressions of that kind of expression. The grammar specified in this section applies to the attribute value after XML 1.0 normalization.So, for example, if the grammar uses the character .The context node, context position, and context size used to evaluate a subexpression are sometimes different from those used to evaluate the containing expression.Several kinds of expressions change the context node; only predicates change the context position and context size (see [2.4 Predicates]).It is a stable document and may be used as reference material or cited as a normative reference from other documents.
Both XSLT and XPointer extend XPath by defining additional functions; some of these functions operate on the four basic types; others operate on additional data types defined by XSLT and XPointer.The primary syntactic construct in XPath is the expression. An expression is evaluated to yield an object, which has one of the following four basic types: The context position is always less than or equal to the context size.The variable bindings consist of a mapping from variable names to variable values.The English version of this specification is the only normative version. A list of current W3C Recommendations and other technical documents can be found at This specification is joint work of the XSL Working Group and the XML Linking Working Group and so is part of the W3C Style activity and of the W3C XML activity.