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I tried to create an xml file based on http://gwtruts.sourceforge.net/schema/GWTruts/GWTrutsSchema.xsd through File -> New File -> Xml -> Xml Document, but unfortunately the code completion does not work. It only shows "No suggestion". The xml validator works perfectly. I checked the xsd file and it seems that there is no problem with xml schema. I also tried to create an xml file based on http://api.facebook.com/1.0/facebook.xsd but I faced the same problem, the code completion didn't work.
Will be fixed in next release
*** Bug 161979 has been marked as a duplicate of this bug. ***
Should be fixed in 7.1 dev by downloading the referenced file to a project-private cache.