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Error in the XML-Declaration

Syntax of version designation is correct, but doesn't occur in real life

HTTP-Header:

Content-Type: application/xhtml+xml; charset=ISO-8859-1

  1: <?xml version="a:Z-._0" encoding="ISO-8859-1"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  3:     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4: 
  5: <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="de" lang="de">
  6:   <head>
  7:     <title>illegal xml version</title>
  8:   </head>
  9:   <body />
 10: </html>

The syntax of this version designation "a:Z-._0" is right, but the meaning of it is totally stupid.
At the moment only XML version 1.0 exists, but the version designation has to be validated, so that future XML-Versions can be valitated according to the right DTD or scheme.

v2.6.12 - 19.8.2008 © validome.org - all rights reserved	Datenschutzerklärung