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  1. or download this
    xmlns="http://www.w3.org/1999/xhtml"
  2. or download this
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  3. or download this
    $xpc->registerNs( xml => "http://www.w3.org/1999/xhtml" );
  4. or download this
    $xpc->registerNs( h => "http://www.w3.org/1999/xhtml" );