& in get href

Jonathan Vanasco <[email protected]>
Newsgroups gmane.comp.lang.perl.modules.petal
Message-ID <[email protected]> 
petal seems to turn all & instances into &amp;

i tried using &amp; which is 'well formed xml'
no luck

then i tried changing the petal input/output formats
no luck

if i do
     tal:attributes="href structure string:a&b"

then its fine

my question is:
   must i do that?  will browsers handle &amp; well or will that  
screw up my get/post vars
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