RE: Compute sum of a computed node list

"Could you provide a small sample input and template that generates the
error where you would have expected otherwise?

Regards,
Ragulf Pickaxe :) "

THE XSLT FILE
===================    

<xsl:template match="abcd_list">
        <abcd_list>
            <xsl:for-each select="abcd">
                <abcd>                 
                    <xsl:variable name="state_local_salary"
select="state_local_salary"/>
                    <xsl:variable name="quarterly_sessions"
select="quarterly_sessions"/>
                    <xsl:variable name="non_medicaid_sessions"
select="non_medicaid_sessions"/>                    
                    <xsl:variable name="var_state_local_match"
select="$state_local_salary * ($quarterly_sessions div
($non_medicaid_sessions))"/>
                     
              
                    <state_local_match>
                        <xsl:value-of
select="format-number($var_state_local_match,'###,###.##','MyFormat')"/>
                    </state_local_match>

                </abcd>
            </xsl:for-each>
            <state_local_match_total>
            <xsl:value-of
select="format-number(sum(rehab/state_local_match[number(.)!='-']),'###,###.
##','MyFormat')"/>
        </state_local_match_total>
        </abcd_list>
    </xsl:template>

SAMPLE FILE
===============

<?xml version="1.0" encoding="UTF-8"?>
<abcd_list>
    <abcd num="1">        
        <state_local_salary>1600.0</state_local_salary>
        <quarterly_sessions>12</quarterly_sessions>
        <non_medicaid_sessions>2</non_medicaid_sessions>        
    </abcd>
    <abcd num="2">        
        <state_local_salary null="true"/>
        <quarterly_sessions>9</quarterly_sessions>
        <non_medicaid_sessions>2</non_medicaid_sessions>        
    </abcd>
    <abcd num="3">        
        <state_local_salary>1700.0</state_local_salary>
        <quarterly_sessions>7</quarterly_sessions>
        <non_medicaid_sessions>2</non_medicaid_sessions>       
    </abcd>
    <abcd num="4">       
        <state_local_salary>1700.0</state_local_salary>
        <quarterly_sessions>5</quarterly_sessions>
        <non_medicaid_sessions>2</non_medicaid_sessions>        
    </abcd>
</abcd_list>