Open issues:

-- LaTeX generation does not work without hacking and 
   by hand transformations of the generated code.

-- attributes are neither type-checked nor set into the instances, and
   there is no mechanism to recover them and use them.

-- defaults are neither type-checked nor set.A

-- structural constraints are neither typechecked nor stored

-- test-executions, test-results, and their entire management
   inside DOF is very unclear.

-- Hovering over doc-class references is not implemented

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