Show group participations of a foaf:Person

[elf-pavlik]

In my personal profile I would like to have list of groups in which I participate, related to issue #7

[haschek]

This is not trivial, because the Foaf vocabulary don't have a member_of relation straight. Currently Foafpress cannot internally use Sparql for more complex cases like this ... any ideas how to make a person-group relation from the person to the group?