The first method, epitomeor abridgment, entails summarizing or paraphrasing the original text or texts. These notes, generally presented in the order of the text from which they were produced, are often called adversaria. The second method is to select passages of interest for their content or their style, which are copied and sorted under a thematic or topical heading to facilitate retrieval.
I'd never even dreamed that there were names for what I had always considered semi-idle scribbling. Must we label everything?