Semantics of ">", ">=", "<", <=" with URI values

The query syntax for oslc.where supports a query term that uses ">", ">=", "<", or "<=" with a URI value. However, the semantics are undefined.

For example, what does the following mean, if anything?

oslc.where=dcterms:creator > <http://example.com/user/David>

The only use case I can think of where this might add value is where the value is a URI of an enumeration member. If an enumeration has members defined with rdf:value denoting ordering, then a query such as:

oslc.where=cm:severity > cm:Medium

might be useful. However, the spec does not define how enumeration members might be compared.