All you really need is a pattern for what starts a sub tree. In your
case, that's a "section" with no "section" ancestors. Count those to
get the sub tree number and count *from* the last one of those for the
figure number:
Thanks, it makes so much sense once you know how.
I thought it might end up needing to be split into two number functions but
this is the first time I have seen the "from" attribute used.
Thanks again
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