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In the case of C1 characters, this restriction is a backwards incompatibility; it was introduced to allow common encoding errors to be detected.
XML has also provided the base language for communication protocols such as XMPP. In publishing, DITA is an XML industry data standard.There are many other text encodings that predate Unicode, such as ASCII and ISO/IEC 8859; their character repertoires in almost every case are subsets of the Unicode character set.XML allows the use of any of the Unicode-defined encodings, and any other encodings whose characters also appear in Unicode.IETF RFC:3023, now superseded by RFC:7303, gave rules for the construction of Internet Media Types for use when sending XML.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.
The material in this section is based on the XML Specification.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.XML also provides a mechanism whereby an XML processor can reliably, without any prior knowledge, determine which encoding is being used.