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https://jira.duraspace.org/browse/DS-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=26820#comment-26820
 ] 

João Melo commented on DS-1372:
-------------------------------

Hi Ariel, it works. Just think it would be fair to add your name to the 
contributors list.
I've pulled for that change on your forked repo.
                
> Change OAI2.0 DSpaceMetadataExistsFilter to check for one or more fields 
> -------------------------------------------------------------------------
>
>                 Key: DS-1372
>                 URL: https://jira.duraspace.org/browse/DS-1372
>             Project: DSpace
>          Issue Type: Bug
>          Components: OAI-PMH
>    Affects Versions: 3.0
>            Reporter: Ariel J. Lira
>            Assignee: João Melo
>              Labels: oai, oai-contexts, oai-filters
>             Fix For: 3.0
>
>         Attachments: DSpaceMetadataExistsFilter.java, 
> DSpaceMetadataExistsFilter.patch
>
>
> Class org.dspace.xoai.filter.DSpaceMetadataExistsFilter accepts or rejects 
> items based on the existence of a single field among its metadata (indicated 
> as an argument). While for most cases this is sufficient, in other cases it 
> becomes necessary to check for the existence of at least one of many fields.
> As an example, in sedici.unlp.edu.ar, we have 2 metadata fields for 
> authors:"sedici.creator.corporate" and "sedici.creator.person", so in order 
> to filter out all items without authors, we should accept only items with 
> either or both metadata fields. 
> In OAI2.0 configuration syntax:
> <Filter id="authorexistsFilter">
>       <Class>org.dspace.xoai.filter.DSpaceMetadataExistsFilter</Class>
>       <Parameter key="fields">
>               <Value>sedici.creator.person</Value>
>               <Value>sedici.creator.corporate</Value>
>       </Parameter>
> </Filter>
> I attach a plain diff file (aginst git head) and the full .java file. 

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