From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
---|---|
To: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
Cc: | Hannu Krosing <hannu(at)2ndQuadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com> |
Subject: | Re: xpath processing brain dead |
Date: | 2009-03-02 09:05:37 |
Message-ID: | 1235984737.16176.780.camel@ebony.2ndQuadrant |
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Lists: | pgsql-hackers |
On Sun, 2009-03-01 at 18:22 -0500, Andrew Dunstan wrote:
> I think the XML type needs to conform to the SQL/XML spec. However, we
> are trying to apply XPath, which has a different data model, to that
> type - hence the impedance mismatch.
>
> I think that the best we can do (for 8.4, having fixed 8.3 as best we
> can without adversely changing behaviour) is to throw the
> responsibility
> for ensuring that the XML passed to the function is an XML document
> back on the programmer. Anything else, especially any mangling of the
> XPath
> expression, presents a very real danger of breaking on correct input.
Can we provide a single function to bridge the gap between fragment and
document? It will be clearer to do this than to see various forms of
appending/munging, even if that function is a simple wrapper around an
append.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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