<ds:X509IssuerSerial xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
  <ds:X509IssuerName>C=US,ST=Hawaii,L=Honolulu,O=SimpleSAMLphp HQ,CN=SimpleSAMLphp Testing CA,emailAddress=noreply@simplesamlphp.org</ds:X509IssuerName>
  <ds:X509SerialNumber>2</ds:X509SerialNumber>
</ds:X509IssuerSerial>