[xsl] Multiple Sort Key Components

Hello,
I'm attempting to sort the content of a variable using multiple sort key 
components and my last component (@range_length) doesn't take effect. Given 
this input which reflects paragraphs in document order:
 <list_of_group_ranges>
                        <range comment_id="2"
                               start_element="d34e70"
                               end_element="d34e141"
                               range_length="10"/>
                        <range comment_id="3"
                               start_element="d34e70"
                               end_element="d34e160"
                               range_length="14"/>
                        <range comment_id="4"
                               start_element="d34e70"
                               end_element="d34e102"
                               range_length="5"/>
                        <range comment_id="17"
                               start_element="d34e174"
                               end_element="d34e214"
                               range_length="26"/>
                        <range comment_id="18"
                               start_element="d34e174"
                               end_element="d34e193"
                               range_length="22"/>
                        <range comment_id="23"
                               start_element="d34e203"
                               end_element="d34e209"
                               range_length="25"/>
</list_of_group_ranges>
I want to sort these according to 3 sort components:1. document order2. 
@start_element value3. @range_length value
The code I'm using to sort is:
                       <xsl:for-each select="$list_of_group_ranges/*">     
                            <xsl:sort select="position()"/>
                            <xsl:sort select="@start_element"/>
                            <xsl:sort data-type="number" order="descending"  
select="@range_length"></xsl:sort>                           
                            <xsl:copy-of select="."/>
                        </xsl:for-each>
But the last sort component, @range_length, isn't taking effect as the <range> 
elements with the same @start_element don't sort according to @range_length. 
What am I missing?
Thanks
Don
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