Validator wrong?

Jurgen De Vos <[email protected]>
Newsgroups gmane.org.w3c.validator
Message-ID <[email protected]> 
Dear Sir, Madam,

I am trying to get my website (http://www.reiskriebels.nl) validated using the w3 validator.

However, It seems that the issues that have come up all correspont to the use of the facebook like button and the Google plus button (both use non W3 validated attributes).

But this one seems very strange indeed:

-

Line 3,
column 49:
there is no attribute "lang"

…s="http://www.w3.org/1999/xhtml" lang="nl" xml:lang="nl" version="XHTML+RDFa 1…

Is it possible this is wrong? How should I otherwise interpret this?

Many thanks for your answer,

Jurgen De Vos

http://www.reiskriebels.nl
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