XML(Extensible Markup Language)은 W3C에서 다른 특수 목적의 마크업 언어를 만드는 용도에서 권장되는 다목적 마크업 언어이다. XML은 SGML의 단순화된 부분집합이지만, 수많은 종류의 데이터를 기술하는 데 적용할 수 있다. XML은 주로 다른 시스템, 특히 인터넷에 연결된 시스템끼리 데이터를 쉽게 주고 받을 수 있게 하여 HTML의 한계를 극복할 목적으로 만들어졌다.
목차
1 XML 기반 언어
2 기본 개념
3 웰 폼(Well-formed) 문서와 유효 XML 문서
4 같이 보기
5 바깥 고리
편집 XML 기반 언어
XML 기반 언어는 다음과 같다.
보기
RDF
RSS
Atom
MathML
XHTML
SVG
이들 언어들은 단일하게 규정된 방식으로 정의되었기 때문에, 사전 정보가 없어도 이들 언어로 작성된 문서에 대해 수정이나 유효성 검사를 하는 프로그램도 제작할 수 있다.
편집 기본 개념
XML에서의 기본 개념에는 10가지가 있다.
XML은 구조적인 데이터를 위한 것이다.
XML은 다소 HTML 같이 보인다.
XML은 텍스트이며, 읽혀지는 것만을 뜻하지 않는다.
XML은 크기가 커진다.
XML은 기술의 집합이다.
XML은 새로운 기술이 아니라 발전한 기술이다.
XML은 HTML에서 XHTML로 이끌었다.
XML은 모듈식이다.
XML은 RDF와 시맨틱 웹의 토대이다.
XML은 라이선스 제약이 없으며, 플랫폼이 독립적이고, 많은 지원이 있다.
편집 웰 폼(Well-formed) 문서와 유효 XML 문서
XML 문서에는 두 가지 수준의 수정 절차가 있다:
웰 폼(Well-formed) : 웰 폼 문서는 모든 XML의 구문을 허용한다. 예를 들어, 한 요소가 닫기 태그와 자체 닫기 없이 열기 태그를 가지고 있으면, 웰 폼이라고 부르지 않는다. 웰 폼이 아닌 문서는 XML이 된다고 말하지 않는다. 순응 파서(역자 주 - 파서: 컴퓨터에 입력된 정보를 번역, 처리하는 프로그램의 하나)는 이를 처리하도록 허용하지 않는다.
유효 : 유효 문서는 추가적으로 몇 가지 의미적 규칙을 허용한다. 이러한 규칙들은 사용자 정의로 되어 있거나, XML 계획 또는 DTD로 포함된다. 예를 들어, 어느 문서가 정의되지 않은 태그를 포함하고 있으면, 유효한 것이 아니다. 유효화 파서는 이를 처리하도록 허용하지 않는다.
편집 같이 보기
XML 처리 API: DOM, SAX, E4X
CSS, XSL
DTD, XML Schema
AST
XRI, XDI
ASN.1
WBXML
XLink
편집 바깥 고리
W3C XML 홈페이지
XML 1.0 기술 규격
XML 1.1 기술 규격
주석이 있는 XML 기술 규격
XML 보급/확장을 위한 XML 인터넷 데이터 센터
EasyXML
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3i Group PLC - Doc re. 2011 Annual Report and Accounts
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