I keep a directory of notes as .org files, and use publish to generate .html from them.  This produces sitemap.html - a table of the #+TITLEs, and theindex.html built from #+INDEX entries I have added.

I would like a third summary .html page which lists the notes organised in a tree by subject classification, where the subject classification is something like the ACM Computing Subject Classification or the Dewey Decimal system, or some cut-down version of these.

The result would look a bit like this, where the _underlined_ items are links to notes.

Information Technology

    Software and its Engineering

        Modelling Languages

            _Dynamic Logic for UML Sequence Diagrams_

    Computing Methodologies

        Knowledge Representation

            _Translating ACL to FOL_

Reading the  manual, it looks like I could use TAGS to give the notes subjects, and use these to do searches over the whole project in emacs.  This, and the way theindex.html is produced by including a simple looking theindex.inc text file makes me think that the solution may not be very hard. However, my lisp is very weak :-(

Any suggestions or code most welcome!

Cheers,

Greg