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Official website, World Wide Web Consortium (W3C) XML 1.0 Specification; Retrospective on Extended Reference Concrete Syntax Archived 2019-11-18 at the Wayback Machine by Rick Jelliffe; XML, Java and the Future of the Web (1997) by Jon Bosak; The Official (W3C) Markup Validation Service; The XML FAQ originally for the W3C's XML SIG by Peter Flynn
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
XML Schema, published as a W3C recommendation in May 2001, [2] is one of several XML schema languages. It was the first separate schema language for XML to achieve Recommendation status by the W3C.
W3C XML Schema is complex and hard to learn, although that is partially because it tries to do more than mere validation (see PSVI). Although being written in XML is an advantage, it is also a disadvantage in some ways. The W3C XML Schema language, in particular, can be quite verbose, while a DTD can be terse and relatively easily editable.
XML namespaces are used for providing uniquely named elements and attributes in an XML document. They are defined in a W3C recommendation . [ 1 ] [ 2 ] An XML instance may contain element or attribute names from more than one XML vocabulary.
XML Information Set (XML Infoset) is a W3C specification describing an abstract data model of an XML document in terms of a set of information items. [1] The definitions in the XML Information Set specification are meant to be used in other specifications that need to refer to the information in a well-formed XML document .
XHTML 1.0 was "a reformulation of the three HTML 4 document types as applications of XML 1.0". [7] The World Wide Web Consortium (W3C) also simultaneously maintained the HTML 4.01 Recommendation.
XML Linking Language, or XLink, is an XML markup language and W3C specification that provides methods for creating internal and external links within XML documents, and associating metadata with those links.