
Replaces Persisted Object Hierarchy.
There is no file; only meta-data.
The decision was made to persist know file types rather than having ad-hoc meta-data schemas. We decided that it was better to have a group of known schemas that users would know what meta-data was available for those types. This helps prevent users from creating version hell with schema types for these well-know objects.
Replaced by Persisted Object Hierarchy #2.