It would be useful to directly use the Ontologies since they are already loaded
Two implementation of Alignment loading: one with intermediate file and one without.
The second alignment is meet with the first one meaning that for
any pair (o, o', n, r) in O and (o, o', n', r) in O' the resulting
alignment will contain:
( o, o', meet(n,n'), r)
any pair which is in only one alignment is preserved.