> There's a common trick to prevent bots scanning sites and collecting 
> email addresses 

which assumes the screen scraper can't read xml or html syntax which is less and
less common, but anyway

standard xslt 1 doesn't honour doe in attributes, saxon has an extension
to allow this, I'm not sure which engine you are using from php
(libxslt? sablotron?, ...) I don't see anything in exslt but perhaps
your processor has a specific extension cf
http://saxon.sourceforge.net/saxon6.5.5/extensions.html#disable

David

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