[xquery-talk] exiting the for

Martin Probst martin at x-hive.com
Wed Mar 1 17:55:35 PST 2006

> Hello, is there any way to exit from the for clause  before reaching the end of the binding sequence?

The "for-loop" is not actually a loop, so there is no way of exiting it
- in functional languages you don't have that kind of flow control.

However optimising XQuery implementations will probably not evaluate the
whole loop if you just use parts of the result, e.g.:
> subsequence(for $i in 1 to 1000
>             return $i,
>             1,
>             10)
will only evaluate the first 10 elements of the sequence from the for
loop as the others are not needed for the result of the "subsequence"


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