Schemas and Ontologies, Cont.

Simple Contraints

Documents are created by People

<http://purl.org/dc/elements/1.1/creator> 
<http://www.w3.org/2000/01/rdf-schema#range> 
<http://example.org/vocab#People> .

<http://purl.org/dc/elements/1.1/creator> 
<http://www.w3.org/2000/01/rdf-schema#domain> 
<http://example.org/vocab#Document> .

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
             xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
  <rdf:Property rdf:about="http://purl.org/dc/elements/1.1/creator">
    <rdfs:label>Author/Creator</>
    <rdfs:range rdf:resource = "http://example.org/vocab#People" />
    <rdfs:domain rdf:resource = "http://example.org/vocab#Document" />
  </rdf:Property>
</rdf:RDF>