compare a cell of a matrix with all other

Hello,
I need some help.
I have a matrix of a optional number of columns and rows. The question in
this example has two answers. The first answer is the solution in the first
cell, and the second answer is the solution in the second cell of a row. The
student can write the answer in a optional row. I had to compare the first
solution "Vorarlberg" with the valid_input of the first cell in the first row, the
second row, and so on.  At this example "Vorarlberg" is right at the second
row: Now i had to compare the second answer "Bregenz" in the second cell of
the actual row. Is the first answer right i had to sum the points of the first
solution, is the second answer right I had to do the same.
My xsl does not really work, the xml structure follows.

<xsl:template match="MultipleAnswer" mode="table">
<xsl:for-each select="table/row">
  <xsl:call-template name="sum_m" />
</xsl:for-each>
</xsl:template>

<xsl:template name="sum_m">
<xsl:param name="i" select="1" />
<xsl:param name="last" select="count(child::*)" />
<xsl:param name="sum" select="0" />
<xsl:variable name="answer" select="cell[$i]/solution" />

<xsl:choose>
  <xsl:when test="$i &lt; $last + 1">
    <xsl:variable name="total">
      <xsl:for-each select="../row">
        <xsl:choose>
          <xsl:when test="contains(cell[$i]/solution/@valid_input,
$answer)">
            <xsl:value-of select="cell[$i]/solution/@points" />
          </xsl:when>
          <xsl:otherwise>
            0
          </xsl:otherwise>
        </xsl:choose>
      </xsl:for-each>
    </xsl:variable>
    <xsl:call-template name="sum_m">
      <xsl:with-param name="i" select="$i + 1" />
      <xsl:with-param name="sum" select="$sum + $total" />
    </xsl:call-template>
  </xsl:when>
  <xsl:otherwise>
    <td style="width:20px"><xsl:value-of select="$sum" /></td>
  </xsl:otherwise>
</xsl:choose>
</xsl:template>


<MultipleAnswer>
<notice>Die Reihenfolge der Eingabe spielt keine Rolle!</notice>
<question>Nenne alle Österreichischen Bundesländer und deren
Hauptstädte!</question>
<table>
  <column>Bundesland</column>
  <column>Hauptstadt</column>
  <row number="1">
    <cell>
      <solution type="text" points="0"
valid_input="Tirol">Vorarlberg</solution>
    </cell>
    <cell>
      <solution type="text" points="1"
valid_input="Innsbruck">Bregenz</solution>
    </cell>
  </row>
  <row number="2">
    <cell>
      <solution type="text" points="2"
valid_input="Vorarlberg">Tirol</solution>
    </cell>
    <cell>
      <solution type="text" points="3"
valid_input="Bregenz">Innsbruck</solution>
    </cell>
  </row>
  <row number="3">
    <cell>
      <solution type="text" points="4"
valid_input="Salzburg">Salzburg</solution>
    </cell>
    <cell>
      <solution type="text" points="5"
valid_input="Salzburg">Salzburg</solution>
    </cell>
  </row>
  <row number="4">
    <cell>
      <solution type="text" points="6"
valid_input="Oberösterreich"></solution>
    </cell>
    <cell>
      <solution type="text" points="7" valid_input="Linz"></solution>
    </cell>
  </row>
  <row number="5">
    <cell>
      <solution type="text" points="8"
valid_input="Niederösterreich"></solution>
    </cell>
    <cell>
      <solution type="text" points="9" valid_input="Sankt
Pölten"></solution>
    </cell>
  </row>
  <row number="6">
    <cell>
      <solution type="text" points="10" valid_input="Wien"></solution>
    </cell>
    <cell>
      <solution type="text" points="11" valid_input="Wien"></solution>
    </cell>
  </row>
  <row number="7">
    <cell>
      <solution type="text" points="12" valid_input="Burgenland"></solution>
    </cell>
    <cell>
      <solution type="text" points="13" valid_input="Eisenstadt"></solution>
    </cell>
  </row>
  <row number="8">
    <cell>
      <solution type="text" points="14" valid_input="Steiermark"></solution>
    </cell>
    <cell>
      <solution type="text" points="15" valid_input="Graz"></solution>
    </cell>
  </row>
  <row number="9">
    <cell>
      <solution type="text" points="16" valid_input="Kärnten"></solution>
    </cell>
    <cell>
      <solution type="text" points="17" valid_input="Klagenfurt"></solution>
    </cell>
  </row>
</table>
</MultipleAnswer>



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