PropertyDefinition :: schemaVersion - Schema version for property definition
The schema version is the active schema version number for accessing the related data type. The currently active schema version might be less than the database schema version when the referenced data type did not change in the last schema update.
If the function is not called with a valid database property definition it throws an exception.
Return value: Major version number ( int32 )
Major versions are defined on database level. database versions are numbered consecutively beginning with 0, when consistent versioning has been enabled.