What an odd comment to have as a sibling to mine from yesterday showing how to do it with two small templates in xsl (after a minor tweak to the xml):

  <xsl:template match="series">
  <h2><xsl:value-of select="@name"/></h2>
  <table>
    <tr><th>Skylanders figure</th><th>Note</th></tr>
    <xsl:apply-templates select="/skylanders/figure[@series=current()/@id]"><xsl:sort select="name"/></xsl:apply-templates>
  </table>
  </xsl:template>

  <xsl:template match="figure">
  <tr class="element-{ @element }">
    <td><xsl:value-of select="@name" /></td>
    <td><xsl:value-of select="@note" /></td>
  </tr>
  </xsl:template>

No explicit loops necessary.