<md:AttributeService xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata" Binding="urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST" Location="https://whatever/" ResponseLocation="https://foo.bar/" xmlns:test="urn:x-simplesamlphp:namespace" test:attr="value">
  <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">Some</ssp:Chunk>
</md:AttributeService>