Having studied, and attempted to build, a few taxonomies / information hierarchies myself (a fraught endeavour, perhaps information is not in fact hierarchical? (Blasphemy!!!)), I'm wondering how stable the present organisational schema will prove, and how future migrations might be handled.
(Whether for this or comparable projects.)
<https://en.wikipedia.org/wiki/Taxonomy>
<https://en.wikipedia.org/wiki/Library_classification>