Validating XML/XHTML in email

I'm thinking it might be a good idea to use the "quality" of an XML/XHTML
email's structure as a metric for spamminess. More errors are likely to
imply spam. Does there exist a lightweight validator that can quickly
produce a metric of how many errors exist in a message? Ideally this would
be something I could invoke from a Perl process, perhaps over a pipe to a
validation server (similar to the way ClamAV and SpamAssassin can be
invoked).

onsgmls -wxml -s -E 5000 xml.dcl yourfile.xml 2>&1 | grep ':E:' | wc -l
>
onsgmls is in the OpenSP package.

onsgmls -wxml -s -E 5000 xml.dcl yourfile.xml 2>&1 | grep ':E:' | wc -l
>
onsgmls is in the OpenSP package.

Peter Flynn <peter.nosp@m.silmaril.iewrote in news:6mcaioFg2irhU1
@mid.individual.net:
>>
With that hint I found that "tidy -eq" gives a pretty good result. To
normalize the score, I figure it makes sense to divide the resulting line
count by the byte count of the input file.