Consider the following XML:

<?xml version="1.0" encoding="ISO-8859-1"?>
<catalog>
    <cd>
        <title>Empire Burlesque</title>
        <artist>
            <name>Bob</name>
            <surname>Dylan</surname>
        </artist>
        <country>USA</country>
        <company>Columbia</company>
        <price>10.90</price>
        <year>1985</year>
    </cd>
</catalog>

I want to add elements to this XML using XSLT, to get the following result:

<?xml version="1.0" encoding="ISO-8859-1"?>
<catalog>
    <cd>
        <title>Empire Burlesque</title>
        <artist>
            <name>Bob</name>
            <surname>Dylan</surname>
            <!-- NEW -->
            <middlename>???</middlename>
        </artist>
        <country>USA</country>
        <company>Columbia</company>
        <price>10.90</price>
        <year>1985</year>
        <!-- NEW -->
        <comment>great one</comment>
    </cd>
    <!-- NEW -->
    <cd>
      <title>Hide your heart</title>
        <artist>
          <name>Bonnie</name>
          <surname>Tyler</surname>
        </artist>
        <country>UK</country>
        <company>CBS Records</company>
        <price>9.90</price>
        <year>1988</year>
    </cd>
</catalog>

To achieve that, I wrote the following XSLT:

<?xml version="1.0" encoding="ISO-8859-1"?>

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <xsl:template name="injectXml">
    <xsl:param name="whatToInject"/>
    <xsl:copy>
      <xsl:copy-of select="node() | @*"/>
      <xsl:copy-of select="$whatToInject"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="//catalog">
    <xsl:call-template name="injectXml">
      <xsl:with-param name="whatToInject">
        <cd>
          <title>Hide your heart</title>
            <artist>
              <name>Bonnie</name>
              <surname>Tyler</surname>
            </artist>
            <country>UK</country>
            <company>CBS Records</company>
            <price>9.90</price>
            <year>1988</year>
        </cd>
      </xsl:with-param>
    </xsl:call-template>
  </xsl:template>

  <xsl:template match="//cd[year=1985]">
    <xsl:call-template name="injectXml">
      <xsl:with-param name="whatToInject">
        <comment>great one</comment>
      </xsl:with-param>
    </xsl:call-template>
  </xsl:template>

  <xsl:template match="//cd[year=1985]/artist">
    <xsl:call-template name="injectXml">
      <xsl:with-param name="whatToInject">
        <middlename>???</middlename>
      </xsl:with-param>
    </xsl:call-template>
  </xsl:template>

</xsl:stylesheet>

Why it's not working? How to do it?