Suggested natures and purposes for WSDL

Can anyone suggest RDDL natures and purposes for WSDL documents?  We document all of our namespaces with RDDL.

Doug Ransom
Interoperability Architect
Power Measurement
2195 Keating X Road
Saanichton, BC, Canada  V8M 2A5
Tel: 1-(250) 652-7100  
E-Mail: <mailto:>
Website: <http://www.pwrm.com/>

ION(r)  smart energy everywhere(tm)