umbrello/object_factory.cpp function makeObjectFromXMI() :
- Map UML2 PrimitiveType to UMLClassifier with base type ot_Datatype.

umbrello/attribute.cpp function load() :
- Replace direct accesses to QDomElement::attribute("xmi.id") by
  Model_Utils::getXmiId()
- If no xmi.id attribute is found in tempElement then check for attribute
  "href". If href is found then look for a hashmark (#) in its value. If
  found then extract the substring following the hashmark and seek this
  name in the Datatypes folder. If found then set m_pSecondary to the
  datatype object found; else create a new datatype with this name, and
  set m_pSecondary to the new datatype object.

CCBUG:56184