1) 数据描述规范(DDS data description specification) AS/400的操作系统OS/400提供一种描述数据属性的方法DDS，它可以在程序外部方便、有效地对数据属性进行描述。
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最后建立了基于XML的想定数据描述规范——想定描述标记语言(SDML)。
At last, the scenario description Markup Language (SDML) was created which is XML based scenario data description standard.
在处理电子邮件和附件时，您可能已经遇到过MIME类型，但MIME规范描述了识别数据格式的更通用的机制。
You may have run across MIME types when working with E-mail and attachments, but the MIME specification describes a more general-purpose mechanism for identifying data forms.
被称为资源描述框架（RDF）的 W3C 系列规范就是服务于这个目的的技术，它用来建立描述数据的语义结构。
The W3C family of specifications collectively known as the Resource Description Framework (RDF) serves this purpose of providing methodologies to establish syntactic structures that describe data.
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