In the Product Sales Data example Data Assets graph, The NORTHWIND Physical Data Model instance has a violation with the realized as property shape. The property shape indicates the object must be an instance of edg:DataContainer. NORTHWIND-Production is an instance of edg:RelationalDatabase. Relational Database does not inherit from Data Container thus the violation. The same type of violation occurs in the other Data Asset examples that contain Physical Model instances.
edg:DataContainer is defined as:
"A 'Data container' is a collection of logical structures of data, or schema objects. In a relational database a container would contain tables. For example, for Oracle databases a data container is called a 'Schema'."
It's not clear to me how this should be resolved.