Validating xml parser definition
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In computing, Extensible Markup Language (XML) is a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable.
The W3C's XML 1.0 Specification It is a textual data format with strong support via Unicode for different human languages.
Although the design of XML focuses on documents, the language is widely used for the representation of arbitrary data structures such as those used in web services.
Several schema systems exist to aid in the definition of XML-based languages, while programmers have developed many application programming interfaces (APIs) to aid the processing of XML data.
The essence of why extensible markup languages are necessary is explained at Markup language (for example, see Markup language § XML) and at Standard Generalized Markup Language.
Hundreds of document formats using XML syntax have been developed, including RSS, Atom, SOAP, SVG, and XHTML. are based on XML and the rich features of the XML schema specification.
XML has also provided the base language for communication protocols such as XMPP. In publishing, DITA is an XML industry data standard.
XML is used extensively to underpin various publishing formats.
XML is widely used in a Services Oriented Architecture (SOA).
Disparate systems communicate with each other by exchanging XML messages.
The message exchange format is standardised as an XML schema (XSD). XML has come into common use for the interchange of data over the Internet.
IETF RFC:3023, now superseded by RFC:7303, gave rules for the construction of Internet Media Types for use when sending XML. Further guidelines for the use of XML in a networked context appear in RFC 3470, also known as IETF BCP 70, a document covering many aspects of designing and deploying an XML-based language.