•[+] Other tools use itRadioland and numerous other utilities readily create and consume OPML files.
•[-] It's missing descriptions as a standard data elementFor example, it'd be nice to be able to create outlines of blog entries. Not nicely crowbarred into OPML.
6Create something new(2)My leading proposal is for a hierarchical RSS. Many of the same fields, plus a few more to support outline rendering (eg. expansion state).
•[+] Aim to create something fresh and useful, yet familiar and accessible