Improving an ontology over time! A use case I've seen is to maintain a consistent tree-like display across different pages of a science website, microbiomedb.or

Improving an ontology over time! A use case I've seen is to maintain a consistent tree-like display across different pages of a science website, microbiomedb.org. You'd load up an ontology as an .xml, use the UI to browse the nodes and a hierarchy you already have, decide how to handle the new thing you want to achive and add a new leaf somewhere or rejiggle the tree somehow, and at the end you save the changed .xml.