1) Create VDB
2) Add Virtual Model that has one Source model dependency to VDB. This should result in an "Empty" Data source name since this is not a source model.
3) Save VDB and get following exception stating that the data source name is basically required.

Caused by: javax.xml.bind.MarshalException

• with linked exception:
  [org.xml.sax.SAXParseException: cvc-complex-type.4: Attribute 'name' must appear on element 'source'.]
  at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:317)
  at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:243)
  at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:75)
  at org.teiid.designer.vdb.Vdb$2.tryToDo(Vdb.java:372)
  at com.metamatrix.core.modeler.util.OperationUtil.perform(OperationUtil.java:37)
  ... 51 more
  Caused by: org.xml.sax.SAXParseException: cvc-complex-type.4: Attribute 'name' must appear on element 'source'.
  at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)