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The url exists: http://tagungshotels.com/index.php?sprache=it&plz=21100&ort=Varese&hotel=874&name=Quality-Yes-Hotel-MXP
...and it can be validated just fine. It just needs to be URI encoded when added to validator's "uri" parameter, which is what a browser does automatically when the URL is entered to the validator's front page form and the form is submitted. http://validator.w3.org/check?uri=http%3A%2F%2Ftagungshotels.com%2Findex.php%3Fsprache%3Dit%26plz%3D21100%26ort%3DVarese%26hotel%3D874%26name%3DQuality-Yes-Hotel-MXP&charset=%28detect+automatically%29&doctype=Inline&group=0