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<h1>For Expressions</h1>
<p>The expression <code>for $x in E1 return E2</code> returns the sequence that results from evaluating
<code>E2</code> once for every item in the sequence <code>E1</code>. Note that <code>E2</code> must
use the range variable <code>$x</code> to refer to the item being
tested; it does not become the context item. For example, <code>sum(for $v in order-item return
$v/price * $v/quantity)</code> returns the total value of (price times quantity) for all the
selected <code>order-item</code> elements.</p>
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