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XSLT uses XPath to identify subsets of the source document tree and perform calculations. XPath also provides a range of functions, which XSLT itself further augments. XSLT 1.0 uses XPath 1.0, while XSLT 2.0 uses XPath 2.0. XSLT 3.0 will work with either XPath 3.0 or 3.1.
XPath (XML Path Language) is an expression language designed to support the query or transformation of XML documents. It was defined by the World Wide Web Consortium (W3C) in 1999, [1] and can be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document.
anywhere in a tag, for example xsl:value-of.select and xsl:variable.name. name() the name of the tag being processed. Useful if the matching criteria contains |s (pipe symbols). any conditional or match criterion, for example xsl:if.test, xsl:when.test, xsl:template.select and xsl:for-each.select. @ an attribute within the XML.
By contrast, XSLT is a two-language system in which XPath expressions can be nested in XSLT instructions but not vice versa. XSLT is currently stronger than XQuery for applications that involve making small changes to a document (for example, deleting all the NOTE elements).
XPath (XML Path Language) is a query language for selecting nodes from an XML document. XSLT (Extensible Stylesheet Language Transformations) is a language for transforming XML documents into other XML documents or other formats such as HTML for web pages, plain text, etc.
The XQuery and XPath Data Model (XDM) is the data model shared by the XPath 2.0, XSLT 2.0, XQuery, and XForms programming languages. It is defined in a W3C recommendation. [1] Originally, it was based on the XPath 1.0 data model which in turn is based on the XML Information Set.
The "/" operator is generalized in XPath 2.0 to allow any kind of expression to be used as an operand: in XPath 1.0, the right-hand side was always an axis step. For example, a function call can be used on the right-hand side. The typing rules for the operator require that the result of the first operand is a sequence of nodes.
XSLT: XSLT is the best known XML transformation language. The XSLT 1.0 W3C recommendation was published in 1999 together with XPath 1.0, and it has been widely implemented since then. XSLT 2.0 has become a W3C recommendation since January 2007 and implementations of the specification like Saxon 8 are already available.