Passing parameter into xsl:for-each

I have an XML data dictionary which I am trying to use to create a SQL DDL 
statement. The XML is below:

======================================================================================
<?xml version="1.0" encoding="UTF-8"?>
<dictionary>
        <columns>
                <column name="COMP_CODE" length="25"/>
                <column name="RENW_STOR_PROF_CODE" datatype="number" 
length="10" decimals="2"/>
                <column name="ACCSS_AUDIT_DATE" datatype="date"/>
                <column name="VAR_LINE_NUM" datatype="number" length="5"/>
                <column name="VAR_LINE_ROOT_FLAG" length="1"/>
        </columns>
        <tables>
                <table name="M_RENW_STOR_PROF_H" global="Y" publish="Y" 
ui="im_178">
                        <column name="COMP_CODE" null="N"/>
                        <column name="RENW_STOR_PROF_CODE" null="N"/>
                        <index primary="Y">
                                <column name="COMP_CODE"/>
                                <column name="RENW_STOR_PROF_CODE"/>
                        </index>
                </table>
                <table name="M_RENW_STOR_PROF_D" global="Y" publish="Y" 
ui="im_178">
                        <column name="COMP_CODE" null="N"/>
                        <column name="ACCSS_AUDIT_DATE" null="N"/>
                        <index primary="Y">
                                <column name="COMP_CODE"/>
                                <column name="RENW_STOR_PROF_CODE"/>
                        </index>
                        <constraint parentTable="M_RENW_STOR_PROF_H"/>
                </table>
        </tables>
</dictionary>
========================================================================================
I have written the following xsl:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
        <xsl:template match="/dictionary/tables">
                  <xsl:for-each select="table">
                                <xsl:variable name="tablename" select="@name" />
                                create table 
                                <xsl:value-of select="$tablename"/>
                                (
                                <xsl:for-each select="column">
                                        <xsl:variable name="columnname" 
select="@name" />
                                        <colname><xsl:value-of 
select="$columnname"/></colname>
                                        <xsl:call-template 
name="columnDataType">
                                                <xsl:with-param 
name="columnname2" select="$columnname"/>
                                        </xsl:call-template>
                                        
                                </xsl:for-each>);
                  </xsl:for-each>
        </xsl:template>
        
        <xsl:template name="columnLength">  
                <xsl:param name="cname"/>
                <name><xsl:value-of select="$cname"/></name>
        </xsl:template> 
        
        <xsl:template name="columnDataType" match="/dictionary/columns">        
         
                 <xsl:param name="columnname2" />
                 <xsl:for-each select="column">
                         <name1><xsl:value-of select="$columnname2" /></name1>
                         <xsl:if test="@name=$columnname2">
                                 <length><xsl:value-of 
select="@length"/></length>
                        </xsl:if>
                </xsl:for-each>
        </xsl:template>
</xsl:stylesheet> 
=================================================================================================
My problem is that in the columnDataType template, the columname2 parameter 
does not appear to be visible inside the xsl:for-each. Is this a known issue or 
am I doing something wrong?

Thanks.