Re: [bdbxml] Query problem

> I have index node-element-equality-string and
> node-element-substring-string on LITERAL.
> If I use a query /SYNSET[SYNONYM/LITERAL="something"], I get correct
> results. But if I try /SYNSET[contains(SYNONYM/LITERAL, "something")], I
> get error saying:
> Error: SequenceType matching failed: the sequence contains more than one
> item [err:XP0006]
>
> Please, how can I search using contains() or starts-with()?
> Thanks for any help.

This is a general XQuery point, nothing to to with any specific
implementation.

The first parameter passed to contains(), starts-with()  etc.must either be
a string or be a sequence containing zero or one items, which can be
silently cast to a string (or the empty string in the case of the empty
sequence.) So if in your target document SYNONYM/LITERAL evaluates to a
single node you are OK. But if it evaluates to a sequence of more than one
nodes you will get the error you describe. The remedy is to use a suitable
predicate to restrict the return sequence to a single member, or rethink
your query strategy so it is never applied when the context node has several
SYNONYM/LITERAL descendants. E.g you could gather all the nodes into a
variable and iterate over them with a FLOWR expression, applying contains()
to each node in turn.

Michael Beddow



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