[xsl] Squire bracket is getting duplicate.

Hi Team,

Is there any logic by which duplicate squire bracket can be avoided
([<xref><sup>[2]</sup></xref>]) . Below are input and output

XSLT:
<xsl:template match="citationref">
 <xref>
  <xsl:attribute name="rid"><xsl:value-of
select="@linkend"/></xsl:attribute>
  <xsl:attribute name="ref-type">bibr</xsl:attribute>
  <sup>
   <xsl:text>[</xsl:text>
   <xsl:apply-templates/>
   <xsl:text>]</xsl:text>
  </sup>
 </xref>
</xsl:template>

Input:
<para>Once ... <citationref linkend="cit379-1">1</citationref>. The
...[<citationref linkend="cit379-2">2</citationref>].</p>

Output:
<p>Once ... <xref rid="cit379-1" ref-type="bibr"><sup>[1]</sup></xref>. The
...[<xref rid="cit379-2" ref-type="bibr"><sup>[2]</sup></xref>].</para>

Required Output:
<p>Once ... <xref rid="cit379-1" ref-type="bibr"><sup>[1]</sup></xref>. The
...<xref rid="cit379-2" ref-type="bibr"><sup>[2]</sup></xref>.</p>





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