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.comPostgreSQL Training, Services and Support
