RDF Property Elements

Inside the <rdf:Description> element, you store the actual elements that describe the subject. In the current example, the predicate is the Creator property, which specifies the document's author, and the object is the name of the author, Nicolas Copernicus:

 <?xml version="1.0" ?>  <rdf:RDF     xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">     <rdf:Description about="http://www.starpowder.com/planets.html">  <Creator>Nicolas Copernicus</Creator>  </rdf:Description> </rdf:RDF> 

The Creator property is not built into the RDF specificationin fact, no properties are. It's up to you to create the named properties you want to use to describe a resource. In fact, a number of property sets, called RDF content description models, already are available. That's useful because they provide some agreement on property names . This means that applications such as Web search engines can make some sense out of the properties you use. The most popular and well supported of these RDF content-description models is the Dublin Core.