character "<" is the first character of a delimiter but occurred as data.

Hello.

One page gives a validation error, but I don't think it should.

Have a look: http://validator.w3.org/check?uri=http%3A%2F%2Fstifu.free.fr%2Fen%2Fabout.php&charset=(detect+automatically)&doctype=Inline&group=0

Isn't this a bug in the validator? This use of the lower than sign seems correct to me.

Thank you.