Thanks for all the responses. We're taking the advice and implementing this
using a span like element for inline text situations and condition attributes
on div like elements where we will permit conditional content. We're going to
keep processing-instructions for setting the conditions since our users want
to be able to define and switch conditions on and off at any point in a
document.

- Craig

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Craig R. Sampson    SAS Institute Inc.  email: craig.sampson@xxxxxxx
  XML Technologies  SAS Campus Drive    phone: (919) 531-7417
                    Cary, NC.  27513    FAX:   (919) 677-4444
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