Charles de Saint-Aignan created UIMA-2391:
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Summary: Uima type merging for string subtypes not working
Key: UIMA-2391
URL: https://issues.apache.org/jira/browse/UIMA-2391
Project: UIMA
Issue Type: Bug
Components: Core Java Framework
Affects Versions: 2.3.1AS
Environment: Linux on Power
Reporter: Charles de Saint-Aignan
Priority: Critical
The basic situation is that we are providing a UIMA-based core that other teams
can extend to suit their needs. As such we are making use of UIMA type merging
to allow them to add new features to existing types. This approach works fine
since JCasGen merges the two definitions of the given type and produces a
superset of the features. This is well documented here:
http://uima.apache.org/d/uimaj-2.3.1/references.html#ugr.ref.jcas.merging_types.jcasgen_support
However, in addition to this, we have the case where we have a string subtype
with given allowedValues - lets say values a, b and c. The other team wants to
extend this type and have additional allowedValues, say value d. Ideally, what
I would like to do is the following (which follows the pattern used for adding
features):
Type Definition #1 (provided by core):
<typeDescription>
<name>com.ibm.Type</name>
<description></description>
<supertypeName>uima.cas.String</supertypeName>
<allowedValues>
<value>
<string>a</string>
<description></description>
</value>
<value>
<string>b</string>
<description></description>
</value>
<value>
<string>c</string>
<description></description>
</value>
</allowedValues>
</typeDescription>
Type Definition #2 (extension to core):
<typeDescription>
<name>com.ibm.Type</name>
<description></description>
<supertypeName>uima.cas.String</supertypeName>
<allowedValues>
<value>
<string>d</string>
<description></description>
</value>
</allowedValues>
</typeDescription>
In this case I wanted UIMA to recognize the two definitions at runtime and
allow the superset of allowedValues. However, this does not do the trick - at
runtime UIMA throws an exception saying that value d is not an allowed value
for com.ibm.Type.
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