subject tree listing from publish

["Greg O'Keefe" <grokodile@gmail.com>]

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Hi,

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

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