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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.
Except for a small number of specifically excluded control characters, any character defined by Unicode may appear within the content of an XML document.
The processor analyzes the markup and passes structured information to an application.
extends the set of allowed characters to include all the above, plus the remaining characters in the range U 0001–U 001F.
At the same time, however, it restricts the use of C0 and C1 control characters other than U 0009 (Horizontal Tab), U 000A (Line Feed), U 000D (Carriage Return), and U 0085 (Next Line) by requiring them to be written in escaped form (for example U 0001 must be written as or its equivalent).
XML also provides a mechanism whereby an XML processor can reliably, without any prior knowledge, determine which encoding is being used.
Encodings other than UTF-8 and UTF-16 are not necessarily recognized by every XML parser.