Idea: Add TDG style in addition to SVG graphics

[tomschr]

Problem

As suggested by @sknorr, the script could offer a second option in "TDG style". For example, the content model of the set element in The Definitive Guide looks like:

set ::=
    Sequence of:
        One of:
            Sequence of:
                Interleave of:
                    title
                    titleabbrev?
                    subtitle?
                info? (db.titleforbidden.info)
            info (db.titlereq.info)
        toc?
        One or more of:
            article
            book
            set
        setindex?

Solution

• add an additional option --style STYLE which allows to choose between tdg and svg
• choose a default

Prerequisites

The tree has to be "clean": "flat", no double entries etc.