If my xml document looks like

<summary>

<us:item xmlns:us="www.us.com">   
<us:value>1000</us:value>
</us:item>

<us:item xmlns:us="www.us.com">   
<us:value>2000</us:value>
</us:item>

<them:item xmlns:them="www.them.com">   
<them:value>1000</them:value>
</them:item>

<them:item xmlns:them="www.them.com">   
<them:value>2000</them:value>
</them:item>

</summary>

is there a simple way of using the sum function to compute a grand total for
the us:values and the them:values?

Thanks,
Daniel Parker


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