title: SAML — how to process a request?
body: <p>I'm a newbie at SAML. My question is simple:</p>
  
  <p>Upon a SAML request, what do IdPs usually do? </p>
  
  <p>I guess they first parse the XML — and then? Can anybody describe the steps? I mean the common steps, that every IdP has to do at the very least.</p>