{HEAD ~ A consumer policy request} for a web service is mediated through {TAIL ~ a functional web service} or a policy web service 
is mediated through
{ HEAD ~ A consumer policy request } for a web service is mediated through { TAIL ~ a functional web service } or a policy web service
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH