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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.
XPath 3 is the latest version of the XML Path Language, a query language for selecting nodes in XML documents. ... embedding the namespace URI inside the prefix.
If there is no default namespace declaration in scope, the namespace name has no value. [6] In that case, an element without an explicit namespace prefix is considered not to be in any namespace. Attributes are never subject to the default namespace. An attribute without an explicit namespace prefix is considered not to be in any namespace.
A QName concisely associates the URI of an XML namespace with the local name of an element, attribute, or identifier in that namespace. [1] To make this association, the QName assigns the local name a prefix that corresponds to its namespace. In all, the QName comprises the URI of the XML namespace, the prefix, and the local name.
It may include a prefix and namespace. It must include the local name of the element. Within a given tree, document order satisfies the following constraints: [5] The root node is the first node. Every node occurs before all of its children and descendants. Namespace Nodes immediately follow the Element Node with which they are associated.
XPath 2.0 is a version of the XPath language defined by the World Wide Web Consortium, W3C. It became a recommendation on 23 January 2007. [1] As a W3C Recommendation it was superseded by XPath 3.0 on 10 April 2014. XPath is used primarily for selecting parts of an XML document. For this purpose the XML document is modelled as a tree of nodes.
Originally, it was based on the XPath 1.0 data model which in turn is based on the XML Information Set. The XDM consists of flat sequences of zero or more items which can be typed or untyped, and are either atomic values or XML nodes (of seven kinds: document, element, attribute, text, namespace, processing instruction, and comment).
XSL began as an attempt to bring the functionality of DSSSL, particularly in the area of print and high-end typesetting, to XML.. In response to a submission from Arbortext, Inso, and Microsoft, [2] a W3C working group on XSL started operating in December 1997, with Sharon Adler and Steve Zilles as co-chairs, with James Clark acting as editor (and unofficially as chief designer), and Chris ...