I recall using a tool called OpenText (possibly OpenText Content Analytics) while working on the metadata project for a major newspaper. That might be the kind

I recall using a tool called OpenText (possibly OpenText Content Analytics) while working on the metadata project for a major newspaper. That might be the kind of tool you're looking for, or at least a starting point to find others. Tooling around graph databases is probably relevant. Try "ontology" as a keyword too.