In general, I echo Michael's comment that we follow the notifications model.
That means using http://dev.w3.org/2009/dap/perms/FeaturePermissions.html I take it? I am still somewhat dubious about that idea given http://weblogs.mozillazine.org/roc/archives/2011/06/permissions_for.html but on the other hand it is annoyingly hard to find an alternative. :(
-- Anne van Kesteren http://annevankesteren.nl/
