[docbook] Marking up optional parameters?

[pvh at wfeet dot za dot net (Peter van Heusden)]

Hi DocBook users

I'm marking up some reference pages for perl modules. I'm describing each 
method of the module using <funcsynopsis>, and then each parameter of 
each method using <paramdef>. Is there a recognised way of noting that 
some parameters are optional (in perl, you don't have function prototypes as 
such, so the typical get/set method is a get method when you don't give it 
an argument, and a set method when you do)?

Peter


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