However, traditional web service discovering technology is done by keyword match based on the syntactic description of web service.
然而传统的服务发现技术是在语法描述的基础上，通过关键词匹配来实现的。
In other words each service that currently has a syntactic description (i.e., a WSDL document) will also have a semantic description in some formalism.
换句话说，现在拥有一个语法描述(例如，一个WSDL文件)的每个服务，都将会有一个某种形式的语义描述。
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.
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。
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