Additional brackets added during conversion

Hello,

I'm working with xsl files to convert docbook xml to nroff. I'm using the
files: db2man.xsl, lists.xsl, synop.xsl, and synop.xsl.
Unnecessary square brackets are inserted around
command parameters, the "arg" element,
in the "Synopsis" section during
the conversion. For example, the output: 

  policy [-remove [-no-notify -host <hostname>]]

Contains an additional pair a square brackets that 
are not the source xml file. 

The correct output should be as follows:

  policy -remove [-no-notify -host <hostname>]

How can I eliminate the additional pair of square brackets?

Many thanks,

Lee




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