Hmm. MarkLogic in its extended XQuery mode supports "Shorthand
Positional Predicate Syntax" whereby
(1, 2, 3, 4, 5, 5)[1 to 3]
is interpreted as a synonym for
(1, 2, 3, 4, 5, 5)[fn:position() = (1 to 3)]
Is that the case for eXist? But either way, it seems that both queries
should either succeed or fail; the discrepancy looks like a bug.
On Wed, 22 Feb 2012, Birnbaum, David J wrote:
Dear x-query list,
Using eXist 2.0-tech-preview-rev15878-20120213 (sandbox), I understand why:
let $all := collection('/db/twitter')//tweet
return $all[1 to 10]
returns an error, since a numeric predicate isn't supposed to be a
sequence of more than one atomic value. The error report is:
err:FORG0006: effectiveBooleanValue: first item of '(1, 2, 3, 4, 5, 6,
7Š'
is not a node, and sequence length > 1
What I don't understand is why the following *doesn't* return an error:
let $all := collection('/db/twitter')//tweet
let $range := 1 to 10
return $all[$range]
When I run this second FLWOR, I retrieve my first ten tweets.
What am I misunderstanding?
Thanks,
David
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David Sewell, Editorial and Technical Manager
ROTUNDA, The University of Virginia Press
PO Box 400314, Charlottesville, VA 22904-4314 USA
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