restructuring element hierarchy using xslt

I have an xml document like this:

<het position="1"></het>
<het position="1.1"></het>
<het position="1.1.1"></het>
<het position="1.1.2"></het>
<het position="1.2"></het>
<het position="1.2.1"></het>
<het position="2"></het>
<het position="2.1"></het>
<het position="2.1.1"></het>

and i was trying to get it to look like this:

<het position="1">
        <het position="1.1">
                <het position="1.1.1">
                </het>
                <het position="1.1.2">
                </het>
        </het>
        <het position="1.2">
                <het position="1.2.1">
                </het>
        </het>
</het>
<het position="2">
        <het position="2.1">
                <het position="2.1.1">
                </het>
        </het>
</het>

In other words make it nested. I can get the first set of  elements out by 
doing a contains() function in a predicate (<xsl:template 
match="het[contains(@position, '.')=false]">) but i am having a problem with 
template matching, i know i can't put a template match within a template 
match and this is causing me a bit of trouble.
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