issue #6: Domain API

composite criteria specifications improved
issue #6: Domain API

junction functions removed from criteria interface
issue #6: Domain API

criteria specifications improved
issue #6: Domain API

added negative criteria
issue #6: Domain API

not function removed from criteria interface
issue #6: Domain API

all criteria fixed
issue #6: Domain API

negative criteria specification added
issue #6: Domain API

not in property criteria added
issue #6: Domain API

not in property criteria specification added