Bliss Classification Association – Bibliographic Classification Guide: “The standard categories recognised in “classical” facet analysis are: Thing – kind – part – property – material – process – operation – patient – product – by-product – agent – space – time”.
Why do these people try to specify what facets are useful? Surely if I want to classifcy my content using a facet called “How impressed I was with this content when I first saw it” then that is a perfectly valid facet? This underlying assumption that there are “generic” or “correct” ways of categorizing the world is just, well, wrong. The world doesn’t have an “inherent” classification that we just have to discover. All classification gets its meaning from the people using it, not from the objects being classified.