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DrDoc - 11:17 pm on Feb 21, 2006 (gmt 0)
Disagree. :) In IE, yes. Opera and FF would abort parsing and throw an error since your XML markup is broken. While I don't think that the three -- accessibility, usability, and validation -- are synonymous of one another (you can have one without necessarily having the other), I think they are definitely related and augment the benefits. It is much easier to maintain one (refering to accessibility, usability, or validity) if you are concerned about the other two.
if you fail [validation] for failling to add the / at the end of one <br /> in xhtml - the site will still be accessible.