Remember originally abstract classes
A class that is abstract in the specification, but has to be
instantiated for proxies, can be made non-abstract and marked as
originally abstract in the ExtendedMetadata (new Details entry:
abstract -> true, see EventDefinition).
The templates for Factory and ItemProvider are modified to hide
these classes from the client. They do not appear in the interface
of Bpmn2Factory. They can not be created in the editor, because
they are not added to the child descriptors in ItemProvider.
12 files changed
