SGML says nothing about how a document should be displayed to the user, or rendered on paper. To do that, various languages have been developed to describe stylesheets, including DynaText, Panorama, SPICE, JSSS, FOSI, CSS, and DSSSL.
For DocBook, we are using stylesheets written in DSSSL. For HTML we are using CSS.
The Documentation Project uses a slightly customized version of Norm Walsh's modular DocBook stylesheets.
These can be found in textproc/dsssl-docbook-modular.
The modified stylesheets are not in the ports system. Instead they
are part of the Documentation Project source repository, and can be
found in doc/share/xml/freebsd.dsl
. It is well
commented, and pending completion of this section you are encouraged to
examine that file to see how some of the available options in the
standard stylesheets have been configured in order to customize the
output for the FreeBSD Documentation Project. That file also contains
examples showing how to extend the elements that the stylesheet
understands, which is how the FreeBSD specific elements have been
formatted.
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