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[This message was posted to XML4LIB earlier, now here on the advice a respondent.] SRW/U specifies an optional 'numberOfRecords' sub-parameter in the response for a scan operation. I'm wondering how best to aggregate the 'numberOfRecords' data according to different fields. For example, if a search index contains records from multiple collections, you might want to break down the number of records from each collection. Or, by a particular metadata field, such as dc.type. I can't find anything built into the specification that explicitly allows this kind of kind of aggregation. Is it something one would do with an 'extraTermData' extension, similar to the 'requestedTerm' example? That example is here: http://srw.cheshire3.org/extensions/requestedTerm.html Has anyone tried to do this kind of aggregation with a local implementation of SRW/U? Any advice is appreciated, including thoughts on the general question of the advisability of hacking on the SRW/U spec to meet local needs. Will Sexton Metadata Architect / Programmer Duke University Libraries _______________________________________________ XML4Lib mailing list [log in to unmask] http://lists.webjunction.org/mailman/listinfo/xml4lib