Registering classes in the root/interop namespace.

Hi,
I am trying to register a bunch of classes that derive from CIM_RegisteredProfile in the “root/interop” namespace, like DMTF specifies. However, I get the following error :
Parsing error: parse error: Could not find declaration for Qualifier named Provider

I even tried registering with the root/PG_InterOp namespace, but ended up with the following error:
Parsing error: parse error: Error adding class Xen_RegisteredSystemVirtualizationProfile to the repository: CIM_ERR_INVALID_SUPERCLASS: CIM_RegisteredProfile

What is the correct way to register a class in the interop namespace ? Is it supported by pegasus ?

Thanks

-          Shashi