<alg:DigestMethod xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport" Algorithm="http://www.w3.org/2001/04/xmlenc#sha256">
  <ssp:Chunk xmlns:ssp="urn:x-simplesamlphp:namespace">Some</ssp:Chunk>
</alg:DigestMethod>