[tex-eplain] Three level indexing in eplain

[John Culleton]

At the front end eplain.tex was not set up to handle three levels of 
indexing. There is a coment to the effect that the author felt no need for 
three levels. I suspect he was just weary of the project at that point. And 
the notation for two levels:
\sidx{foo}[bar] 
is a bit clumsy. I discovered through experimentation that the LaTeX style 
notation could be substituted e.g., 
\sidx{foo!bar}
or even
\sidx{foo!bar!yond}.
Such notation is treated by the eplain front end as a single level and the 
code is passed through unchanged to to makeindex via file.idx  Makeindex 
however  creates an item, a subitem and a subsubitem from this code in 
file.ind.  

There is in fact a definition of \subsubitem in eplain.tex. The above 
technique allows one to use it.  The other good features of indexing via 
eplain.tex are not adversely affected by this trick AFAIK. 
-- 
John Culleton
WexfordPress - http://wexfordpress.com
Able Indexers and Typesetters
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