Cassis cannot load a type system with types inheriting from "uima.tcas.DocumentAnnotation"

[reckart]

Describe the bug Cassis cannot parse the attached type system.

TS-DocumentAnnotationBug.xml.zip

Expected behavior It should just work.

Error message

Traceback (most recent call last):
  File ".../sandbox.py", line 11, in <module>
    typesystem = load_typesystem(f)
  File ".../dkpro-cassis/cassis/typesystem.py", line 701, in load_typesystem
    return deserializer.deserialize(source)
  File ".../dkpro-cassis/cassis/typesystem.py", line 795, in deserialize
    t = types[type_name]
KeyError: 'uima.tcas.DocumentAnnotation'

[jcklie]

Solved via #143