Can not convert number to a NodeList

Hi everyone. I'm trying to put this simple cycle to work :

<xsl:for-each select="$line">
        <xsl:for-each select="$column">
                <td><xsl:text>C</xsl:text></td>
        </xsl:for-each>

        <xsl:if test="$line&gt;1">
                <tr><xsl:text>L</xsl:text></tr>
        </xsl:if>
</xsl:for-each>

but i'm always getting an exception: Can not convert number to a NodeList 
.
Yes this variables are numbers that must be passed to my xsl file.
I'm initializing them this way
<xsl:variable name="column" select="number(fi:styling/@column")/>
.

Any ideas how to workaround this? I've tried exslt.org but haven't found
what i needed.

TIA,
CarlosN.


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