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From Eddie Epstein <eaepst...@gmail.com>
Subject Re: How to work with ByteArray feature value
Date Thu, 23 Sep 2010 13:50:04 GMT
Hi Diman,

Yes, there is a bug in TypeSystemUtil.typeSystem2TypeSystemDescription().
The fix is already checked in against
https://issues.apache.org/jira/browse/UIMA-1877

Thanks for finding and helping to isolate this problem.
Eddie

On Thu, Sep 23, 2010 at 4:37 AM, Diman Karagiozov <diman@tetracom.com> wrote:
>  Hi Eddie,
>
> Indeed, the type system used for the de-serialization differs from the one
> used for serialization.
> In the process of serialization I am doing the following:
>
> // serialize the cas
>            final ByteArrayOutputStream osCas = new ByteArrayOutputStream();
>            XmiCasSerializer.serialize( cas.getCas(), osCas );
>
> // serialize the type system
>            final ByteArrayOutputStream osTS = new ByteArrayOutputStream();
>            TypeSystemUtil.typeSystem2TypeSystemDescription(
> cas.getTypeSystem() ).toXML( osTS );
>
> In the type system, before serialization, I have the feature feature:
> <featureDescription>
> <name>hypernyms</name>
> <description>List of hypernyms</description>
> <rangeTypeName>uima.cas.ByteArray</rangeTypeName>
> <multipleReferencesAllowed>true</multipleReferencesAllowed>
> </featureDescription>
>
> However, in the serialized version of the type system, the
>  "<multipleReferencesAllowed>true</multipleReferencesAllowed>" is missing
> and this causes the problem...
>
> <featureDescription>
> <name>hypernyms</name>
> <description/>
> <rangeTypeName>uima.cas.ByteArray</rangeTypeName>
> </featureDescription>
>
>
> I have also other ByteArray features and the "multipleReferencesAllowed" is
> missing for all of them in the serialized version.
>
> Is this a bug or there is another way to serialize the type system, so that
> the "multipleReferencesAllowed" is handled correctly?
>
> greetings
> Diman
>
> On 09/21/2010 12:13 AM, Eddie Epstein wrote:
>>
>> On Mon, Sep 20, 2010 at 9:50 AM, Eddie Epstein<eaepstein@gmail.com>
>>  wrote:
>>>
>>> Hi Diman,
>>>
>>> Indeed the problem is Xmi deserialization. It looks like ByteArray
>>> features must be defined with
>>>              <multipleReferencesAllowed>true</multipleReferencesAllowed>
>>>
>>> At first glance this is missing from our documentation. Will double check
>>> that.
>>>
>> In fact UIMA is working as designed. It appears that your XmiCas data
>> was serialized out with multipleReferencesAllowed=true for the feature
>> hypernyms, but then deserialized with a different typesystem where
>> multipleReferencesAllowed=false.
>>
>> Eddie
>
>

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