wsdl ontology

Dear Group,
   I have some question about the wsdl ontology[1] :

1) for a lot of properties it is defined only the range. Why?

2) what is an example of the usage of this ontology? I have to refer to
wsdl-rdf from a WSDL maybe using SAWSDL?

Apologies if this is not the correct newsgroup to send this
question to.


Thank you in advance
Romina

[1] www.w3.org\ns\wsdl-rdf