[xsl] endless rekursion

["Markus Hanel" <markus.hanel@xxxxxx>]

hallo,

sorry about my terrible english.

my problem is to check out a check box question, to see if the answer is
right or false.
the given answer of the student to the question is given in the solution tag
(right =1 wrong =0), the valid_input presents the right answer the teacher
has given. to see how many right answers are given, my idea is counting the
correct cells and counting the wrong cells. the variable correct should give
out the difference of the right and wrong answers. it should be a number
written into a cell of a table.

is this possible?

xml part
<CheckBoxQuestion>
  <notice>in Europa kennen wir uns aus!</notice>
  <question>Welche der nachfolgenden Länder gehören zur EU?</question>
  <option number="1">
    <text>Deutschland</text>
    <solution type="bool" points="4" valid_input="1"></solution>
  </option>
  <option number="2">
    <text>Schweiz</text>
    <solution type="bool" points="5" valid_input="0"></solution>
  </option>
  <option number="3">
    <text>Österreich</text>
    <solution type="bool" points="6" valid_input="1"></solution>
  </option>
  <option number="4">
    <text>Türkei</text>
    <solution type="bool" points="7" valid_input="0"></solution>
  </option>
</CheckBoxQuestion>

xsl part
<xsl:template match="CheckBoxQuestion" mode="table">
  <xsl:apply-templates select="option" mode="check" />
</xsl:template>


<xsl:template match="option" mode="check">
  <xsl:variable name="correct_cells" select=".
|following-sibling::option/solution[valid_input = 1]" />
  <xsl:apply-templates select="$correct_cells" mode="check" />

  <xsl:variable name="false_cells" select=".
|following-sibling::option/solution[valid_input = 0]" />
  <xsl:apply-templates select="$false_cells" mode="check" />

    <xsl:variable name="correct" select="count($correct_cells) -
count($false_cells)" />

    <xsl:choose>
      <xsl:when test="$correct &gt;= 0">
        <td><xsl:value-of select="$correct" /></td>
      </xsl:when>
      <xsl:otherwise>
        <td>0</td>
      </xsl:otherwise>
    </xsl:choose>

</xsl:template>

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