See an XSLT implementation of grouping with any number (dynamically defined) 
of levels:

   http://www.npcwm.xslt.com/html/xsl-list/2004-12/msg01030.html

Cheers,
Dimitre Novatchev


"Colin Bowern" <colin.bowern@n...> wrote in message 
news:utI4zM7zGHA.4648@T......
>I have a document where I want to group based on values several levels 
>deep:
>
> <SalesOrder ...>
>    <LineItems>
>        <LineItem Id="1" DeliveryAddressId="Shipping" DeliveryMethodId="1" 
> SupplierId="A" />
>        <LineItem Id="2" DeliveryAddressId="Shipping" DeliveryMethodId="2" 
> SupplierId="A" />
>        <LineItem Id="3" DeliveryAddressId="Shipping" DeliveryMethodId="1" 
> SupplierId="B" />
>        <LineItem Id="4" DeliveryAddressId="Billing" DeliveryMethodId="2" 
> SupplierId="B" />
>    </LineItems>
> </SalesOrder>
>
> The above example should ideally end up in four purchase orders because of 
> the combination of delivery address, method, and supplier.  For example:
>
> <PurchaseOrder SupplierId="A" DeliveryMethod="1">
>    <DeliveryAddress Id="Shipping" .. />
>    <LineItems>
>        <LineItem Id="1" />
> </PurchaseOrder>
>
> At this point I've gotten to a point where I can build out single 
> line-item purchase orders based on this information.   Ideally I want to 
> aggregate based on the three values using XSLT.
>
> Has anyone seen this scenario before?  Are there any good resources that 
> you could share to help me understand what functions/approaches to take to 
> resolve this?
>
> Thanks,
> Colin
>