| From: | Peter Eisentraut <peter_e(at)gmx(dot)net> |
|---|---|
| To: | "Nikolay Samokhvalov" <nikolay(at)samokhvalov(dot)com> |
| Cc: | pgsql-patches(at)postgresql(dot)org, "Bruce Momjian" <bruce(at)momjian(dot)us> |
| Subject: | Re: xpath_array with namespaces support |
| Date: | 2007-04-04 13:04:15 |
| Message-ID: | 200704041504.15435.peter_e@gmx.net |
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| Lists: | pgsql-hackers pgsql-patches |
Am Mittwoch, 4. April 2007 14:42 schrieb Nikolay Samokhvalov:
> > Why is the function not strict?
>
> Because in case of 3rd argument (NS mappings) being NULL, we shouldn't
> return NULL immediately:
If the namespace mapping is NULL then it is unknown, and therefore the result
of the XPath expression cannot be evaluated with certainty. If no namespace
mapping is to be passed, then you should pass a list(/array/...) of length
zero.
--
Peter Eisentraut
http://developer.postgresql.org/~petere/
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