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Currently, when I use http://validator.w3.org/ to validate http://troels.arvin.dk/db/rdbms/ I get this strange error message: ================================================================== Validation Output: 1 Error 1. Error Line 00, Column 3: 00'. Such values yield warnings. --> ================================================================== As far as I know, the validator normally counts the first line as line 1. And until quite recently, the validator didn't have any such complaints about the page. I believe that this is a false error.
*** This bug has been marked as a duplicate of bug 4892 ***