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A location path matches the production Location Path.In the following grammar, the non-terminals QName and NCName are defined in [XML Names], and S is defined in [XML].
In addition to its use for addressing, XPath is also designed so that it has a natural subset that can be used for matching (testing whether or not a node matches a pattern); this use of XPath is described in XSLT. There are different types of nodes, including element nodes, attribute nodes and text nodes. Thus, the name of a node is modeled as a pair consisting of a local part and a possibly null namespace URI; this is called an expanded-name.To avoid a quotation mark in an expression being interpreted by the XML processor as terminating the attribute value the quotation mark can be entered as a character reference ().Alternatively, the expression can use single quotation marks if the XML attribute is delimited with double quotation marks or vice-versa.XPath defines a way to compute a string-value for each type of node. The data model is described in detail in [5 Data Model].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.