<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="#stylesheet"?>
<!DOCTYPE root [
  <!ATTLIST xsl:stylesheet id ID #IMPLIED>
]>
<root>
<xsl:stylesheet id="stylesheet" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
  <xsl:attribute-set name="a">
	<xsl:attribute name="b">c</xsl:attribute>
  </xsl:attribute-set>
  <xsl:template match="/">
    <b>Please output something!</b>
  </xsl:template>
  <xsl:attribute-set name="a">
	<xsl:attribute name="b">c</xsl:attribute>
  </xsl:attribute-set>
</xsl:stylesheet>
<doc id="foo">this</doc>
</root>