The doctype is usually the first line of any XHTML document, it's also an essential part of the document!
Some documents may contain an additional XML declaration (see below)
Quote:
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Originally Posted by the W3C XHTML Spec
An XML declaration is not required in all XML documents; however XHTML document authors are strongly encouraged to use XML declarations in all their documents. Such a declaration is required when the character encoding of the document is other than the default UTF-8 or UTF-16 and no encoding was determined by a higher-level protocol.
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You could remove the XML declaration from the top of the page's code, but don't try inserting it elsewhere! :o)
Paul