Unallowed overwriting of parameter entities

HTTP-Header:

Content-Type: application/xhtml+xml; charset=UTF-8

  1: <?xml version="1.0" encoding="utf-8"?>
  2: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  3:     "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
  4: [
  5: <!ENTITY % pre.content "(p)">
  6: ]>
  7: <html xmlns="http://www.w3.org/1999/xhtml">
  8:   <head>
  9:     <title></title>
 10:   </head>
 11:   <body>
 12:     <pre><p>...</p></pre>
 13:   </body>
 14: </html>

HTML / XHTML / WML / XML Validator

Error in the Document Type Declaration

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