SGML Maths DTD for ISO 12083 = semantics-based DTD for Mathematics
From: http://www.demon.co.uk/stilo/mathssgml.dtd
The eight-character limit for names is not convenient for
mathematics and, since it will most probably be changed to 16
or 32 in the reference concrete syntax of the next upgrade of
SGML, it has not been observed in this DTD. We have also
assumed that typing full math tags will not be necessary with
any application sophisticated enough to tackle mathematics
so brevity has given way to clarity for the most part.-->
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