Incorrect. Resources are identified by URIs, but they are opaque, n.b. The Opacity Axiom
"The only thing you can use an identifier for is to refer to an object. When you are not dereferencing, you should not look at the contents of the URI string to gain other information."
"The only thing you can use an identifier for is to refer to an object. When you are not dereferencing, you should not look at the contents of the URI string to gain other information."
http://www.w3.org/DesignIssues/Axioms.html#opaque