> The endpoint is /Schemas but what will be the URI of the requested class?
I believe that you have to use the URI of the schema definition - http://www.simplecloud.info/specs/draft-scim-core-schema-00.html#resource-schema.
To retrieve the core user schema you would hit /Schemas/urn:scim:schemas:core:1.0:User.
> Also, is there a way to request that the created Users must have the extended attributes, said differently, must "derive" from the extended class?
I don’t know of any way to introspect the schema to ask this. A POST /Users should fail and return error information if all required attributes aren’t present. Being able to determine this a priori by just using /Schemas might be difficult.
--Kelly