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# RDF Rules * * * RDF uses Web identifiers (URIs) to identify resources. RDF uses properties and property values to describe resources. * * * ## RDF Resources, Properties, and Property Values RDF uses Web identifiers to identify things, and describes resources through properties and property values. Explanation of resources, properties, and property values: * _Resource_ is anything that has a URI, such as "" * _Property_ is a resource with a name, such as "author" or "homepage" * _Property Value_ is the value of a property, such as "David" or "" (note that a property value can be another resource) The following RDF document can describe the resource "": Jan Egil Refsnes  This is a simplified example. The namespace is omitted. * * * ## RDF Statements The combination of resources, properties, and property values forms a _statement_ (known as the subject, predicate, and object of the statement). Let's look at some specific examples of statements to better understand: Statement: "The author of is David." * The subject of the statement is: * The predicate is: author * The object is: David Statement: "The homepage of is " * The subject of the statement is: * The predicate is: homepage * The object is: