I'm using PHP's XSL extension (which uses libxsl, AFAIK).
When I specify

   <xsl:output method="xml" encoding="UTF-8" indent="yes"
   doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
   doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"/>

to the output. This is not needed, because the encoding is not known
at this point and negotiated later according to the HTTP headers. For
the same reason I cannot specify it directly in the <xsl:output>.
Is it possible to turn this feature (bug?) off?