If remaining valid wrt a dtd is important, you can of course use pi's
rather than namespaces/attributes:

<?xml-stylesheet type="text/xsl" href="stylesheet.xsl"?>
<?p1 val1?>
<?p2 val2?>

<top-level-element
  normal-attribute1="x"
  normal-attribute2="y">

and in the stylesheet


<xsl:param name="p1" select="/processing-instruction('p1')"/>
<xsl:param name="p2" select="/processing-instruction('p2')"/>

David


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