There might be new versions of internet drafts and thus links to them my be obsolete. In such case try increment version in link or find the draft on IETF by name. XCAP xcap <ulink url="http://tools.ietf.org/html/rfc4825" >RFC 4825</ulink> - The XCAP specification - The XML Configuration Access Protocol xcap_diff <ulink url="http://tools.ietf.org/html/draft-ietf-simple-xcap-diff" >draft-ietf-simple-xcap-diff-13.txt</ulink> - XCAP changes notifications format xcap_profiles <ulink url="http://tools.ietf.org/html/draft-ietf-sipping-config-framework-16" >draft-ietf-sipping-config-framework-16.txt</ulink> -XCAP user profiles Presence events <ulink url="http://www.ietf.org/rfc/rfc3265.txt">RFC 3265 - SIP Events</ulink> presence <ulink url="http://www.ietf.org/rfc/rfc3856.txt">RFC 3856 - Presence Event package</ulink> pidf <ulink url="http://www.ietf.org/rfc/rfc3863.txt">RFC 3863 - Presence Information Data Format</ulink> rpid <ulink url="http://www.ietf.org/rfc/rfc4480.txt" >RFC 4480 - Rich Presence Extensions to the Presence Information Data Format</ulink> publish <ulink url="http://www.ietf.org/rfc/rfc3903.txt">RFC 3903 - Event state publication</ulink> winfo <ulink url="http://www.ietf.org/rfc/rfc3857.txt">RFC 3857 - Watcher info event package</ulink> winfo_doc <ulink url="http://www.ietf.org/rfc/rfc3858.txt">RFC 3858 - Data Format for watcher info</ulink> reg <ulink url="http://www.ietf.org/rfc/rfc3680.txt">RFC 3680 - SIP Reg Events</ulink> Authorization common auth <ulink url="http://tools.ietf.org/html/rfc4745" >RFC 4745: Common Policy: A Document Format for Expressing Privacy Preferences</ulink> presence auth <ulink url="http://tools.ietf.org/html/rfc5025" >RFC 5025</ulink> - Presence authorization rules and usage with XCAP Resource lists rls <ulink url="http://tools.ietf.org/html/rfc4826" >RFC 4826</ulink> - XML formats for representing resource lists sip rls <ulink url="http://tools.ietf.org/html/rfc4662" >RFC 4662</ulink> - SIP Event Notification Extension for Resource Lists