def request_attr(prefix = 'oai_dc')
  from_time = @from_time.utc.iso8601 if @from_time
  until_time = @until_time.utc.iso8601 if @until_time
  attribute = {:metadataPrefix => prefix, :verb => 'ListRecords'}
  attribute.merge(:from => from_time) if from_time
  attribute.merge(:until => until_time) if until_time
  attribute
end

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 manifestations_url(format: :oai), request_attr('oai_dc')
  @oai[:errors].each do |error|
    xml.error :code => error
  end
  xml.ListRecords do
    @manifestations.each do |manifestation|
      cache([manifestation, fragment: 'list_records_oai', role: current_user_role_name, locale: @locale]) do %>
        xml.record do
          xml.header do
            xml.identifier manifestation.oai_identifier
            xml.datestamp manifestation.updated_at.utc.iso8601
          end
          xml.metadata do
            xml.tag! "oai_dc:dc",
              "xsi:schemaLocation" => "http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd",
              "xmlns:oai_dc" => "http://www.openarchives.org/OAI/2.0/oai_dc/",
              "xmlns:dc" => "http://purl.org/dc/elements/1.1/" do
              xml.tag! "dc:title", manifestation.original_title
              manifestation.creators.readable_by(current_user).each do |patron|
                xml.tag! "dc:creator", patron.full_name
              end
              manifestation.contributors.readable_by(current_user).each do |patron|
                xml.tag! "dc:contributor", patron.full_name
              end
              manifestation.publishers.readable_by(current_user).each do |patron|
                xml.tag! "dc:publisher", patron.full_name
              end
              manifestation.subjects.each do |subject|
                xml.tag! "dc:subject", subject.term
              end
              xml.tag! "dc:description", manifestation.description
            end
          end
        end
      end
    end
    if @resumption.present?
      if @resumption[:cursor].to_i + @manifestations.per_page < @manifestations.total_entries
        xml.resumptionToken @resumption[:token], :completeListSize => @manifestations.total_entries, :cursor => @resumption[:cursor], :expirationDate => @resumption[:expired_at]
      end
    end
  end
end