To be fair to OP, the biggest hurdle in learning anything is knowing what questions to ask. When you don't have ontology as part of your vocabulary it's hard to find literature regarding, say, "comparison of ontologies for user-generated text content".
I suppose this flows back into library science, which is all about systematizing where to look for answers to questions, but I'm always astonished to find that there's oceans of literature and research in questions I haven't even thought to ask.
I think OP is referring to finding software-engineering related design discussions surrounding tagging systems, but yes, I’m sure there is a great depth of ontology material and librarian knowledge that could add to software system designs.
I suppose this flows back into library science, which is all about systematizing where to look for answers to questions, but I'm always astonished to find that there's oceans of literature and research in questions I haven't even thought to ask.