obj["mpackage"] = to_mentity_ref(mpackage)
obj["mgroup"] = to_mentity_ref(mgroup)
obj["intro_mclasses"] = to_mentity_refs(intro_mclasses)
obj["mpackage"] = to_mentity_ref(mpackage)
obj["mgroup"] = to_mentity_ref(mgroup)
obj["intro_mclasses"] = to_mentity_refs(intro_mclasses)