Return the OAISet URL for given community.

        :returns: URL of corresponding OAISet.
        :rtype: str

def oaiset_url(self):
        """Return the OAISet URL for given community.

        :returns: URL of corresponding OAISet.
        :rtype: str
        """
        return url_for(
            'invenio_oaiserver.response',
            verb='ListRecords',
            metadataPrefix='oai_dc', set=self.oaiset_spec, _external=True)