#.name blocking . ( semantics_provides_blocked
                  + sum r : #x:makreel:interface-name replies. #.name reply (r) . semantics_provides_unblocked)
 + sum r : #x:makreel:interface-name replies. #.name reply (r) . semantics_provides_unblocked
 + sum a : #x:makreel:interface-name actions. #.name out (#x:makreel:interface-name action (a)) . semantics_provides_unblocked
