xml.instruct! :xml, :version => "1.0"
xml.tag! "OAI-PMH", :xmlns => "http://www.openarchives.org/OAI/2.0/",
  "xmlns:xsi" => "http://www.w3.org/2001/XMLSchema-instance",
  "xsi:schemaLocation" => "http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd" do
  xml.responseDate Time.zone.now.utc.iso8601
  xml.request oai_provider_url(format: :xml), request_attr(@from_time, @until_time, @oai[:metadataPrefix])
  @oai[:errors].each do |error|
    xml.error :code => error
  end
  xml.ListIdentifiers do
    @manifestations.each do |manifestation|
      cache([manifestation, fragment: 'list_identifiers_oai', role: current_user_role_name, locale: @locale]) do
        xml.header do
          xml.identifier manifestation.oai_identifier
          xml.datestamp manifestation.updated_at.utc.iso8601
          manifestation.series_statements.each do |series_statement|
            xml.setSpec series_statement.id
          end
        end
      end
    end
    if @manifestations.last_page?
      xml.resumptionToken nil, completeListSize: @manifestations.total_count
    else
      xml.resumptionToken CGI.escape(@manifestations.next_page_cursor), completeListSize: @manifestations.total_count
    end
  end
end