FreeBSD Documentation and DocBook SGML

[Al Johnson]

I'm learning about the FreeBSD documentation, and have read the
primer at:
http://www.freebsd.org/doc/en_US.ISO8859-1/books/fdp-primer/
and have a question.

http://www.freebsd.org/docproj/sgml.html
states: "The Documentation Project is trying to use SGML as the
standard method of representing the documentation."

DocBook has been defined using both SGML and XML
(a subset of SGML).

My question is: Why does the FreeBSD Documentation Project
prefer SGML to XML?

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