how to delete an attribute after using it as a test

<!-- ================== -->
<!-- xml snip -->
<!-- ================== -->
<form_field label="First Name" hidden="true" name="fname" size="35"
maxlength="35" />


<!-- ================== -->
<!-- xsl snip -->
<!-- ================== -->
<xsl:template match="form_field">
 <xsl:if test="@hidden = 'true'">
  <xsl:element name="input">
<!--
******************************************
******************************************
**   HERE I WOULD LIKE TO COPY ALL
**   ATTRIBUTES EXCEPT @hidden and @label
******************************************
******************************************
-->
   <xsl:copy-of select="@*"/>
   <xsl:attribute name="type">hidden</xsl:attribute>
  </xsl:element>
 </xsl:if>
</xsl:template>

<!-- ================== -->
<!-- desired output -->
<!-- ================== -->
<input name="fname" size="35" maxlength="35" />


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