Changing <b> to "["

Hi People,

I need to replace 
all <b>  and <i>  with "[" , and
all </b> and </i> with "]"
in a XML file.

Everything was fine with the xsl below,
but when I have a <b><i>text</i></b> sequence
the result is:

  [<i>text</i>]

And I need:

  [[text]]


Do you have some ideia to look inside the match and apply the template
again?

Thank you very much.

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XSL used:

<!--MAIN TEMPLATE-->
<xsl:template match="@*|node()">
  <xsl:copy>
    <xsl:apply-templates select="@*|node()"/>
  </xsl:copy>
</xsl:template>

<!-ELEMENTS B and I-->
<xsl:template match="b|i">
  <xsl:text>[</xsl:text>
  <xsl:copy-of select="@*|node()"/>
  <xsl:text>]</xsl:text>  
</xsl:template>
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