XPath sum

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The sum()-function returns the sum of its argument. This function requires an XPath query as argument. The query must specify an attribute that has a numeric type.

sum(//Sales.Order/TotalPrice)

This query returns the sum of the total prices of all placed orders.

sum(//Sales.Order[Sales.Customer_Order/Sales.Customer/Name = 'Jansen']/TotalPrice)

This query returns the sum of the total prices of all orders placed by a customer named Jansen.