Representing '&' in URLs

[Dan Brickley]

Hopefully a simple but not too simple query...

Can anyone point me to a best practice note on representing URLs that
contain '&' in XML? 

eg. <ABC DEF="http://abc.def/cgi-bin/search.pl?term=foo&query=bar"/>

where we don't want & to generate an error through looking like a broken
XML entity. (Not sure how this was ever allowed in HTML in the first
place, but that's another story...)

I did find a thread at
http://www.lists.ic.ac.uk/hypermail/xml-dev/9711/0035.html
but that was a while back. Is...
 
  <ABC DEF="http://abc.def/cgi-bin/search.pl?term=foo&amp;query=bar"/>

the thing to do?

Dan


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