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A structured document is an electronic document where some method of embedded coding, such as mark-up, is used to give the whole, and parts, of the document various structural meanings according to a schema. A structured document whose mark-up doesn't break the schema and is designed to conform to and which obeys the syntax rules of its mark-up language is "well-formed". As of 2009 the most widely used markup language, in all its evolving forms, is HTML, which is used to structure documents according to various Document Type Definition (DTD) schema defined and described by the W3C, which continually reviews, refines and evolves the specifications. ==Structural semantics== In writing structured documents the focus is on encoding the logical structure of a document, with no explicit concern in the structural markup for its presentation to humans by printed pages, screens or other means. Structured documents, especially well formed ones, can easily be processed by computer systems to extract and present metadata about the document. In most Wikipedia articles for example, a table of contents is automatically generated from the different heading tags in the body of the document. Popular word processors can have such a function available. In HTML a part of the logical structure of a document may be the document body; : : One of the most attractive features of structured documents is that they can be reused in many contexts and presented in various ways on mobile phones, TV screens, speech synthesisers, and any other device which can be programmed to process them. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「structured document」の詳細全文を読む スポンサード リンク
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