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[Semantic Web]RDF & RDF Schema |
Lee 发表于 2006/2/14 18:41:25 |
Although often called a “language”, RDF is essentially a data-model. Its basic building block is an object-attribute-value triple, called a statement.
RDF is domain-independent in that no assumptions about a particular domain of use are made. It is up to users to define their own terminology in a schema language called RDF Schema (RDFS). The name RDF Schema is now widely regarded as an unfortunate choice. It suggests that RDF Schema has a similar relation to RDF as XML Schema has to XML, but in fact this is not the case. XML Schema constrains the structure of XML documents, whereas RDF Schema defines the vocabulary used in RDF data models. In RDFS we can define the vocabulary, specify which properties apply to which kinds of objects and what values they can take, and describe the relationships between objects.
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blog名称:风落沙 日志总数:348 评论数量:550 留言数量:52 访问次数:1593587 建立时间:2005年1月28日 |
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