--- mathmlc2p.xsl	2005-07-11 13:15:34.000000000 -0500
+++ mathmlc2p-12.xsl	2005-07-11 13:16:54.000000000 -0500
@@ -1658,12 +1658,9 @@
       <mo>{</mo><mrow><mfenced open="" close=""><xsl:apply-templates select="m:bvar"/></mfenced><mo>|</mo><xsl:apply-templates select="m:condition"/></mrow><mo>}</mo>
     </xsl:when>
     <xsl:otherwise> <!-- set defined by an enumeration -->
-      <xsl:element name="mfenced">
-        <xsl:attribute name="open">{</xsl:attribute>
-	<xsl:attribute name="close">}</xsl:attribute>
-	<xsl:attribute name="separators">,</xsl:attribute>
+      <mfenced open="{{" close="}}" separators=",">
 	<xsl:apply-templates select="*"/>
-      </xsl:element>
+      </mfenced>
     </xsl:otherwise>
     </xsl:choose>
   </mrow>