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To understand how XOAI works, one must understand the concept of Filter, Transformer and Context. With a Filter it is possible to select information from the data source. A Transformer allows one to make some changes in the metadata before showing it in the OAI interface. XOAI also adds a new concept to the OAI-PMH basic specification, the concept of context. A context is identified in the URL:

http://www.example.com/oai/<context>

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OAI Manager (Solr Data Source)

OAI manager it's an is a utility that allows one to do some certain administrative operations with OAI. 

Syntax

 bin[dspace]/bin/dspace oai <action> [parameters]

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In order to refresh the OAI Solr index, it is required to run the {{[dspace]/bin/dspace oai import }}command periodically. You can add the following task to your crontab:

0 3 * * * [dspace]/bin/dspace oai import

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OAI manager it's an utility that allows one to do some administrative operations with OAI. 

Syntax

 bin[dspace]/bin/dspace oai <action> [parameters]

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In order to refresh the OAI cache and compile DSpace items (for fast responses), it is required to run the {{[dspace]/bin/dspace xoai compile-items }}command periodically. You can add the following task to your crontab:

0 3 * * * [dspace]/bin/dspace oai compile-items

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Each context could have it's own metadata formats. So to add/remove metadata formats to/from it, just need add/remove it's reference within xoai.xml, for example, imagine one need to remove the XOAI schema from:

<Context baseurl="request">
  <Format refid="oaidc" />
  <Format refid="mets" />
  <Format refid="xoai" />
  <Format refid="didl" />
  <Format refid="dim" />
  <Format refid="ore" />
  <Format refid="rdf" />
  <Format refid="etdms" />
  <Format refid="mods" />
  <Format refid="qdc" />
  <Format refid="marc" />
  <Format refid="uketd_dc" />
</Context>

Then one would have:

<Context baseurl="request">
  <Format refid="oaidc" />
  <Format refid="mets" />
  <Format refid="didl" />
  <Format refid="dim" />
  <Format refid="ore" />
  <Format refid="rdf" />
  <Format refid="etdms" />
  <Format refid="mods" />
  <Format refid="qdc" />
  <Format refid="marc" />
  <Format refid="uketd_dc" />
</Context>

It is also possible to create new metadata format by creating a specific XSLT for it. All already defined XSLT for DSpace could be found within directory ${dspace.dir}/config/modules/oai/metadataFormats. So after producing a new one, in ${dspace.dir}/config/modules/oai/xoai.xml* add* *inside element <Formats>  the following information:

<Format id="[IDENTIFIER]">
  <Prefix>[PREFIX]</Prefix>
  <XSLT>metadataFormats/[XSLT]</XSLT>
  <Namespace>[NAMESPACE]</Namespace>
  <SchemaLocation>[SCHEMA_LOCATION]</SchemaLocation>
</Format>

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