&& (entry.val.triple.user == NULL || user == NULL
|| strcmp (entry.val.triple.user, user) == 0)
&& (entry.val.triple.domain == NULL || domain == NULL
&& (entry.val.triple.user == NULL || user == NULL
|| strcmp (entry.val.triple.user, user) == 0)
&& (entry.val.triple.domain == NULL || domain == NULL