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<?xml version="1.0" encoding="UTF-8"?>
<OAI-PMH>
...
<record>
    <header> ... (compare notes about the record header)</header>
    <metadata>
        <dc xmlns="http://www.openarchives.org/OAI/2.0/oai_dc/"
            xmlns:dc="http://purl.org/dc/elements/1.1/">
            <identifier>ID2</identifier>
            <description> Usage Event Data for Server ... from ... until ... </description>
        </dc>
    </metadata>
</record>
...
</OAI-PMH>

Also, the choice of identifiers imposes problems: According to the OAI-PMH specification, the identifier within the DC metadata set must link to the described document. When understood as being metadata, the data contained in one <contextobject> or in a <context-objects> aggregation is best described as being metadata of the usage events in a given time frame. Those usage events, however, regularly do not have their own identifiers yet. So in order to comply with DC requirements, too, identifiers have to be generated for those usage events as well (ID2 in the excerpt above). However, by now there seems to be no immediate use case for such identifiers. Therefore, in the context of these guidelines, offering DC metadata is not required.

4.1.5. Usage of Sets

(see OAI-PMH, 2.7.2 )

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