doxygen for sql

Hi,
I'm interested in adding sql language support in doxygen.
would like to get a head start and information in doing so, mainly
because its been stated as difficulty level 10 in the to-do list of
doxygen. why is it so difficult.
secondly, I tried to use hyper-sql, a documentation generator for sql
on windows, but it didn't work, i mean it generated the html pages etc
but nothing related to the documentation of the code.

regards
Acedip

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