XhtmlStrictDev
UserPageluci
It should noted, that W3C XHTML validator Quote from O'Reily: XML documents do not have to have an XML declaration. However, if an XML document does have an XML declaration, then that declaration must be the first thing in the document. It must not be preceded by any comments, whitespace, processing instructions, and so forth. The reason is that an XML parser uses the first five characters (
http://tikiwiki.org/tiki-index_raw.php?page=XhtmlCssValidate#comments |
have some limitations, so there must be another way to check documents for conformance with XHTML and XML specifications.