ma dov'è l'errore???????????

Line 29, column 4: "DOCTYPE" declaration not allowed in instance

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"

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Line 31, column 66: document type does not allow element "html" here

...tp://www.w3.org/1999/xhtml" lang="it" xml:lang="it">