RE: what is pageregistry.xml file? why it is not coming with pluto 1.1.6

I am trying to integrate JOSSO 1.8 into pluto to implement SSO feature.
but the tutorial i used for that, suggest the change in tag <fragment> int pageregistry.xml file.
It is not coming with pluto 1.1.6, but comes with older version.
please suggest what can i do to tackle that problem?