Rdfs
描述类、子类与属性
定义类：
Rdfs：Resource,rdf:Literal,rdfs:Datatype,Rdfs:Class
定义属性:
Rdfs:range
Rdfs:domain
Rdfs:subClassOf
Rdfs:subPropertyOf
Rdfs:label
Rdfs:comment
其他：
Rdfs:seeAlso
Rdfs:isDefinedBy
定义类eg：
rdf:RDF
<rdfs:Class rdf:ID=”Camera”>
</rdfs:Class>
</rdf:RDF>
定义更多的类：
<rdfs:Class rdf about=””>
</rdfs:Class>
定义子类
<rdfs:Class rdf:about=”…”>
<rdfs:subClassOf rdf:resource=”…”/>
</rdfs:Class>
定义属性
<rdf:Property rdf:about=”…”>
<rdfs:domain rdf:resource=”…”/>
<rdfs:range rdf:resource=”…”/>
</rdf:Property>
SKOS, short for simple knowledge organization systems, is an RDF vocabulary for representing KOSs, such as taxonomies, thesauri, classification schemes, and subject heading lists.
SKOS:build the bridge to ontology