[Therion] Turning some labels on and off

[Andrew Atkinson]

Hi all

Over the years there have been many discussions about how to turn some
but not all labels off, for things like different scales. Lots of
metapost that sort of solves some problems, so I was about to right some
code for my situation

http://wotcc.org.uk/__Transfer/Reads.pdf (work in progress)

For this I need to have some labels only on the combined view, some on
the exploded view and some on both.

I was going to aim at using -attr print comb or -attr print explo and
then use metacode to decide where they should be visible.

Ideally I would just be able to set an attr and then use

symbol-hide attr print:comb but no luck there, unless I messed
something, In the end metacode was not needed, I just chose 2 symbols I
do not use and added them as a -context point raft and context point clay

then

symbol-hide point clay
or
symbol-hide point raft

Bit of a bodge, it would be better if attr could be used, but I think
that this could be used for lots of the problems I found on the mailing
list while looking for a more elegant solution

Andrew