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From "Charles de Saint-Aignan (JIRA)" <...@uima.apache.org>
Subject [jira] [Commented] (UIMA-2391) Uima type merging for string subtypes not working
Date Thu, 26 Apr 2012 14:38:16 GMT

    [ https://issues.apache.org/jira/browse/UIMA-2391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262643#comment-13262643
] 

Charles de Saint-Aignan commented on UIMA-2391:
-----------------------------------------------

Marshall, I've tried to remove all allowedValues in order to essentially allow all values.
 However, this instead allows no values.  I want to come up with a solution that does not
require a major rearchitecture of the core in order to make it extensible.  The only viable
solution I have seen so far is the given patch to UIMA to enable allowedValue merging.  I'm
not entirely following your other potential workarounds.
                
> 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
>         Attachments: UIMA-2391.patch
>
>
> 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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