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XHTML+RDFa (Extensible Hypertext Markup Language + Resource Description Framework in attributes) is an extended version of the XHTML markup language for supporting RDF through a collection of attributes and processing rules in the form of well-formed XML documents. Web standardistas consider this combination as one of the most advanced markup codes available today.〔(【引用サイトリンク】Dr. Leslie Sikos IT professional – Web standardization, accessibility, multimedia )〕 XHTML+RDFa is one of the techniques used to develop Semantic Web content by embedding rich semantic markup. Version 1.1 of the language is a superset of XHTML 1.1, integrating the attributes according to RDFa Core 1.1. In other words, it is an RDFa support through XHTML Modularization. RDFa in XHTML version 1.0 became a World Wide Web Consortium (W3C) Recommendation on 14 October 2008. The current recommendation is RDFa+XHTML version 1.1, which became a W3C Recommendation on 7 June 2012 and was updated with a ”Second Edition” on 22 August 2013. Version 1.1 is based on ( XHTML™ 1.1 - Module-based XHTML - Second Edition ). Version 1.0 was based on the first edition. == Overview == Conventional Web documents contain large amounts of structured data that can be rendered in web browsers. This approach works fine for publishing purposes, however, a large amount of data stored in Web documents cannot be processed this way. XHTML+RDFa can provide machine-readable metadata within the markup code which makes additional user functionalities available. Most important of all, actions can be performed automatically that enables up-to-date publishing, structured search and sharing. RDFa can serve as a bridge between the "human and data webs". The potential in web documents enriched with RDFa is increasing since major search engines begin to process them while indexing. Yahoo indexes RDFa and microformats since 2008 and Google since 2009. The RDFa attribute specifications make it possible to describe structured data in any markup language. The RDFa markup in XHTML+RDFa reuses the markup code, thus eliminating the need for unnecessary duplications. XHTML+RDFa is not widely distributed yet, probably due to the lack of support in authoring tools and content management systems. However, there is good tendency. Drupal 7, for example, supports RDFa. Since the “a” in RDFa stands for attributes, it is straightforward to use CSS selectors to style the code. 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「XHTML+RDFa」の詳細全文を読む スポンサード リンク
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