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It's probably worth making a decision whether to put 
references in for quoted text as well - I'd tend to say
'no', as you'll end up with multiple references. Or you
make the "reference text" be of a form that you can 
pick up when parsing the message - if it's there already,
don't re-reference it. Note also that you probably only
want to do the reference thing for the first occurance of
each link.