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| '''Summary'''
|The ''left fold'' traverses the sequence from the left.
The query <code>fn:fold-left($f1 to 5, 0, 1 to 5$f)</code> for example would be evaluated as:
<pre class="brush:xquery">
$f($f($f($f($f(0, 1), 2), 3), 4), 5)
