...

There are two types of geometric settings on PrmanObjectStatements - those that can vary per instance and those that cannot. The attributes under the prmanStatements.attributes group can vary per instance.  These are also known as "instance attributes".  The attributes under prmanStatements.primAttributes cannot vary per instance.  These are also known as "master prototype attributes".  RfK will flatten master prototype attributes onto the geometry locations, so they can be inherited in Katana.

...