Excluding sections using profiling

All,

I have a quick question (I hope!) about profiling.

 From what I read in the DocBook XSL: A Definitive Guide, I understand 
how to modify the content of any given output by profiling. However, 
what I would like to do is include everything in a document _except_ 
certain sections that have an attribute.

 From what I understand, the only way I can do this is to assign an 
attribute to the sections I want to exclude AND to the sections I want 
to include. Is that correct? Or can I supply a parameter during 
processing that states: "process everything except sections with this 
attribute."

I hope this makes sense! Thanks in advance for any help.

Dave Shevitz