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Count OAI-PMH identifiers for a data provider.
count_identifiers(url = "http://export.arxiv.org/oai2", prefix = "oai_dc", ...)
(character) OAI-PMH base url. Defaults to the URL for arXiv's OAI-PMH server (http://export.arxiv.org/oai2) or GBIF's OAI-PMH server (http://api.gbif.org/v1/oai-pmh/registry)
Specifies the metadata format that the records will be returned in
Curl options passed on to GET
GET
Note that some OAI providers do not include the entry completeListSize (http://www.openarchives.org/OAI/openarchivesprotocol.html#FlowControl) in which case we return an NA - which does not mean 0, but rather we don't know.
completeListSize
if (FALSE) { count_identifiers() # curl options # library("httr") # count_identifiers(config = verbose()) }
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