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A Rights Expression Language or ''REL'' is a machine-processable language used to express copyright or similar status of data (metadata usable for search, compatibility tracking or DRM). Most REL are expressible in XML, but this is not a requirement and any format could be used.〔XrML began in Lisp.〕 Some use RDF and RDF Schema.〔 Although RELs may be processed directly, they will most commonly be encountered when embedded as metadata within other documents, such as eBooks, image, audio or video files. == Notable RELs == Notable RELs include: ; ccREL : An RDF Schema used by the Creative Commons project to express their licences. : This same vocabulary has also been adopted by the GNU Project to express their General Public License (GPL) in machine-readable form.〔(【引用サイトリンク】url=http://www.fsf.org/blogs/licensing/2009-06-rdf )〕〔(【引用サイトリンク】title=GPL in RDF )〕 ; ODRL : An open standard for an XML-based REL. ; XrML : XrML began with work at Xerox in the 1990s.〔(XrML.org )〕 After passing through several versions and separate projects, it later formed the basis of the REL for MPEG-21.〔(【引用サイトリンク】title=The MPEG-21 Rights Expression Language )〕 ; MPEG-21 : Part 5 of this MPEG standard includes a REL.〔(【引用サイトリンク】title=Part 5: Rights Expression Language )〕 ; METSRights : METSRights is an extension schema to the METS packaging metadata standard.〔 (【引用サイトリンク】title=METSRights Schema )〕〔 (【引用サイトリンク】title=METSRights examples )〕 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「Rights Expression Language」の詳細全文を読む スポンサード リンク
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