Создание таблицы и ее закрашивание:
      <table border="1">
        <tr>
          <th>perekonnanimi</th>
          <th>registernumber</th>
        </tr>
        <xsl:for-each select="autod/auto">
          <tr>
            <td>
              <xsl:attribute name="style">background-color:Aqua</xsl:attribute>
              <xsl:value-of select="perekonnanimi"/>
            </td>
            <td>
              <xsl:value-of select="registernumber"/>
            </td>
          </tr>
        </xsl:for-each>
      </table>