Marshall Schor created UIMA-2917:
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Summary: Type System Merging for string subtypes with allowed
values
Key: UIMA-2917
URL: https://issues.apache.org/jira/browse/UIMA-2917
Project: UIMA
Issue Type: Bug
Components: Core Java Framework
Affects Versions: 2.4.0SDK
Reporter: Marshall Schor
Priority: Minor
UIMA uses type system merging to combine separately developed annotators and
their type systems. When the same type is define in multiple type systems,
perhaps with different features, these are "merged" where possible, and if not
possible, exceptions are thrown. The current implementation is missing any
support for merging subtypes of Strings - which UIMA uses for associating
Allowed-Values for. If two type systems define the same-named subtype of
String, no merging of allowed values is done, no exception is thrown if the
allowed value sets are different, and the merge uses the first definition as
the merge result, ignoring the others.
The behavior could be changed to be "strict" - throwing an exception if the
allowed values are not identical, or more lenient - for example, having the
merged definition be the union of the the sets of allowed value. The drawback
to the union approach is that any annotator which was assuming a "closed
universe" of possible values, could now be seeing values not in the set it
expected.
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