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[Semantic Web]RDF中使用xml:lang的注意点 读书笔记,  科学研究 http://www.w3.org/TR/2004/REC-rdf-syntax-grammar-20040210/ RDF/XML permits the use of the xml:lang attribute as defined by 2.12 Language Identification of XML 1.0 [XML] to allow the identification of content language. The xml:lang attribute can be used on any node element or property element to indicate that the included content is in the given language. Typed literals which includes XML literals are not affected by this attribute. The most specific in-scope language present (if any) is applied to property element string literal content or property attribute values. The xml:lang="" form indicates the absence of a language identifier. http://www.w3.org/TR/2004/REC-rdf-concepts-20040210/#dfn-typed-literal Plain literals have a lexical form and optionally a language tag as defined by [RFC-3066], normalized to lowercase. Typed literals have a lexical form and a datatype URI being an RDF URI reference. RDF有一个问题：即RDF中没有专门标识plain literals的URI，只有标识所有literal（= typed literal + plain literal）的rdfs:Literal。 因为这个原因，OWL-S 1.1没有显式指定 textDescription property 的range。 否则，比如早前的OWL-S将它定义为xsd:string，用户将不能这样书写： <profile:textDescription xml:lang="en">Some description</profile:textDescription>因为xsd:string是一种typed literal，不能对它使用xml:lang属性。因此上述写法会造成inconsistency的问题。 徐涵（Han Xu） 发表于 2004/12/16 18:15:41 | 阅读全文(3390) | 回复(0) | 编辑 | 精华

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