XPath min

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

min(//Sales.Order/TotalPrice)

This query returns the lowest total price found in any object.

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

This query returns the lowest total price of an order placed by a customer named Jansen.