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XML includes facilities for identifying the encoding of the Unicode characters that make up the document, and for expressing characters that, for one reason or another, cannot be used directly.extends the set of allowed characters to include all the above, plus the remaining characters in the range U 0001–U 001F.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.그런 스키마 언어들은 전형적으로 어떤 문서에서 사용되어도 좋은 엘리먼트의 종류, 그 엘리먼트들에 적용되어도 좋은 애트리뷰트의 종류, 나타나는 순서, 허용 가능한 부모-자식 관계 등을 제한한다.
This is not an exhaustive list of all the constructs that appear in XML; it provides an introduction to the key constructs most often encountered in day-to-day use.
An example is , where the name of the attribute is "number" and its value is "3".
An XML attribute can only have a single value and each attribute can appear at most once on each element.
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.
XML is widely used in a Services Oriented Architecture (SOA).