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OAI-PMH Data Provider 2.0 (Internals)
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A question is, "is all metadata public?" Presently the answer to this is yes; all metadata is exposed via OAI-PMH, even if the item has restricted access policies. The reasoning behind this is that people who do actually have permission to read a restricted item should still be able to use OAI-based services to discover the content. But, exposed data could be changed by changing the XSLT defined at [dspace]/config/modulescrosswalks/oai/metadataFormats.
Modification Date (OAI Date Stamp)
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As part of each record given out to a harvester, there is an optional, repeatable "about" section which can be filled out in any (XML-schema conformant) way. Common uses are for provenance and rights information, and there are schemas in use by OAI communities for this. Presently DSpace does not provide any of this information, but XOAI core library allows its definition. This require requires to dive into code and perform some changes.
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Each OAI-PMH ListRecords request will return at most 100 records (by default) but it could be configured in the [dspace]/config/modulescrosswalks/oai/xoai.xml
file.
When a resumption token is issued, the optional completeListSize and cursor attributes are included. OAI 2.0 resumption tokens are persistent, so expirationDate of the resumption token is undefined, they do not expire.
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