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DDL (''Description Definition Language'') is part of the MPEG-7 standard. It gives an important set of tools for the users to create their own Description Schemes (DSs) and Descriptors (Ds). DDL defines the syntax rules to define, combine, extend and modify Description Schemes and Descriptors. ==Introduction== DDL is not a modeling language, such as the Unified Modeling Language (UML), but a schematic language to represent the audiovisual data results, which must conform to the descriptors, the description schemes and the MPEG-7 descriptions. MPEG-7 DDL Must: *Be able to express relationships of elements within a DS or between two DS, whether they are structural, spatial, temporal, conceptual or hierarchical. *Give a rich set of unions and references between one or more descriptions and the data they describe. *Be application and platform independent. *Be able to specify the descriptors data type, whether they are primary (integers, text, time, ...) or derived (enumerated, ...). 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「Description Definition Language」の詳細全文を読む スポンサード リンク
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