man.charmap.use.subset — Use subset of character map instead of full map?
If the value of the
man.charmap.use.subset parameter is non-zero,
a subset of the roff character map is used instead of the full roff
character map. The profile of the subset used is determined either
by the value of the
man.charmap.subset.profile
parameter (if the source is not in English) or the
man.charmap.subset.profile.english
parameter (if the source is in English).
You may want to experiment with setting a non-zero value of
man.charmap.use.subset, so that the full
character map is used. Depending on which XSLT engine you run,
setting a non-zero value for
man.charmap.use.subset may significantly
increase the time needed to process your documents. Or it may
not. For example, if you set it and run it with xsltproc, it seems
to dramatically increase processing time; on the other hand, if you
set it and run it with Saxon, it does not seem to increase
processing time nearly as much.
If processing time is not a important concern and/or you can
tolerate the increase in processing time imposed by using the full
character map, set man.charmap.use.subset to
zero.
For converting certain Unicode symbols and special characters in UTF-8 or UTF-16 encoded XML source to appropriate groff/roff equivalents in man-page output, the DocBook XSL Stylesheets distribution includes a roff character map that is compliant with the XSLT character map format as detailed in the XSLT 2.0 specification. The map contains more than 800 character mappings and can be considered the standard roff character map for the distribution.
You can use the man.charmap.uri
parameter to specify a URI for the location for an alternate roff
character map to use in place of the standard roff character map
provided in the distribution.
Because it is not terrifically efficient to use the standard
800-character character map in full -- and for most (or all) users,
never necessary to use it in full -- the DocBook XSL Stylesheets
support a mechanism for using, within any given character map, a
subset of character mappings instead of the full set. You can use the
man.charmap.subset.profile or
man.charmap.subset.profile.english
parameter to tune the profile of that subset to use.