How to create Virtual Sets in OAI?

[euler]

Dear All,

I did not find any documentation on how to create virtual sets in the OAI: https://wiki.lyrasis.org/display/DSDOC6x/OAI. I would like to create virtual sets based on the metadata such as those implemented in Open Knowledge Repository: https://openknowledge.worldbank.org/harvesting-the-okr

Queries for virtual sets in the OKR may be as broad as “Health in Africa” or “Climate Change” or as narrow as “Agribusiness in Tanzania” and “Microfinance in Bangladesh”. The following six sample virtual sets have been created and are now available for other repositories to begin ingesting:

• Health in Africa
• Research relating to China
• Energy in India
• Microfinance in Bangladesh
• Agribusiness in Tanzania
• Climate Change

A long time ago, I asked about this in Stackoverflow: https://stackoverflow.com/q/52360308/1919069 but I don't want to create a new "Metadata Format", but instead I want to create Sets based on the metadata (e.g. create a set for items if dc.subject contains a certain word).

In [dspace]/config/crosswalks/oai/xoai.xml, there is a filter there for Thesis type:

        <!-- This condition determines if an Item has a "dc.type" field

             which contains "Thesis". -->

        <CustomCondition id="thesisDocumentTypeCondition">

            <Class>org.dspace.xoai.filter.DSpaceAtLeastOneMetadataFilter</Class>

            <Configuration>

                <string name="field">dc.type</string>

                <string name="operator">contains</string>

                <string name="value">Thesis</string>

            </Configuration>

        </CustomCondition>

But that filter will only apply to the metadata format uketd_dc. What I would want is to create a filter that will create Sets available to all Metadata Formats. Is this possible (I assume yes because it is already implemented in OKR, I just don't know how)? Can this be done just by modifying XSLT?

Thanks in advance!

euler

[Michael Plate]

Hi,

I struggled with a similar problem some weeks ago and found this

http://dspace.2283337.n4.nabble.com/Create-OAI-Set-td4690783.html

helpful.
At least we now have sets with DDC and dc.type an some more.


Am 17.03.21 um 03:56 schrieb euler:

> Dear All,
>
> I did not find any documentation on how to create virtual sets in the
> OAI: https://wiki.lyrasis.org/display/DSDOC6x/OAI. I would like to
> create virtual sets based on the metadata such as those implemented in
> Open Knowledge

[…]

CU

Michael

[Claudia Jürgen]

Hello Euler,

yes this is possible and can be done in

https://github.com/DSpace/DSpace/blob/dspace-6.3/dspace/config/crosswalks/oai/xoai.xml

1. Define a Set
<Sets>
        <Set id="YourNameForTheSet">
            <Spec>YourSpecNameForTheSet</Spec>
            <Name>YourDisplayNameForTheSet</Name>
            <Filter ref="YourFilter"/>
        </Set>
</Sets>

2. Define the filter and condition or use existing filters and conditions
Filter:

<Filters>
        <Filter id="YourFilter">
            <Definition>
                <Custom ref="YourCondition"/>
            </Definition>
        </Filter>
</Filters>

Filters can be more complex and contain Conditions with relations like
https://github.com/DSpace/DSpace/blob/dspace-6.3/dspace/config/crosswalks/oai/xoai.xml#L307

Condition:

        <CustomCondition id="YourCondition">
            <Class>org.dspace.xoai.filter.DSpaceAtLeastOneMetadataFilter</Class>
            <Configuration>
                <string name="field">dc.type.publicationtype</string>
                <string name="operator">equal</string>
                <string name="value">article</string>
            </Configuration>
        </CustomCondition>
       
       
3. Use the set in the context(s) you need it in
<Context ...>
    <Set ref="YourNameForTheSet" />
</Context>

Hope this helps

Claudia Jürgen

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Claudia Juergen

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[euler]

Hi Claudia and Michael,

Thank you so much for the response! Now I can create virtual sets with specific conditions.

Best regards,

euler