标准编号：ISO/IEC 21000-20:2016
中文名称：信息技术 多媒体框架（MPEG-21） 第20部分：合同表示语言
英文名称：Information technology — Multimedia framework (MPEG-21) — Part 20: Contract Expression Language
发布日期：2016-12
标准范围
This document specifies a language for representing contracts in the Multimedia Framework formed for the transaction of MPEG-21 Digital Items or services related to the MPEG-21 Framework.Contract Expression Language (CEL) aims at digitally representing the agreements made in environments using ISO/IEC 21000. These agreements are contracts for transactions of content packed as Digital Items, as well as services provided around this content.The range of contracts under scope are as follows:— contracts about transactions on rights for the exploitation of content as MPEG-21 Digital Items;— contracts about the provision of MPEG-21-based services, i.e. delivery, identification, encryption, search and others.The aspects represented by CEL contracts include the following:— the textual clauses, in natural language as they are in the narrative contract, duly structured;— the operative clauses, as computer language expressions.
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