[Therion] map title

[Bruce]

>> If you are intentionally selecting multiple maps (so that they may
>> individually be turned on and off in the resulting output pdf),

>You may define the maps in "index" file, so you may create as many as  
>you need such layouts with different map subsets and change only the  
>layout index name in source file. In this way you may have allways the  
>"top" map with name of subset.

If I understand correctly, that is a similar approach to what I use to
provide a quick useful control to toggle map titles and other features.  For
a larger cave system that is 'growing' rapidly I am finding that running
multiple map INDEXes becomes unwieldy. The authors have to remember to keep
them all up to date.  (Problem with authors imagination, memory and
communication with each other, not the the INDEX approach).
A single 'top' map does not however result in a particularly usefully
layered pdf file.  I like to be able to supply pdf files in which the user
can turn on or off each cave, the surface image or the previews as they
wish.  Particularly where one or more caves are stacked one above the other.
Bruce