For Expressions
The expression for $x in E1 return E2
returns the sequence that results from
evaluating E2
once for every item in the sequence E1
. Note that
E2
must use the range variable $x
to refer to the item being
tested; it does not become the context item. For example, sum(for $v in order-item
return $v/price * $v/quantity)
returns the total value of (price times quantity)
for all the selected order-item
elements.