Part of it is trivial. i.e. is "9606" used to identify a species or a pubmed paper. (While trivial it's a huge source of errors, a bit like manually managing me

Part of it is trivial. i.e. is "9606" used to identify a species or a pubmed paper. (While trivial it's a huge source of errors, a bit like manually managing memory trivial but still a huge source of CVEs) The other is for logical data quality inference. E.g. data is coded by super sub class, while query asks for middle class the right data is still retrieved. This goes beyond that into ever more complicated scenarios which are not double by connect by queries. Which get's into questions is the hind leg of an ant similar enough to a human leg to have an argument about the function of a protein transfer. (Uberon)