8.3.3: uncovered Xml2 functionality

From: Francesco Biasiol <francesco(dot)biasiol(at)swg(dot)it>
To: pgsql-hackers(at)postgresql(dot)org
Subject: 8.3.3: uncovered Xml2 functionality
Date: 2008-06-13 15:09:35
Message-ID: 48528DAF.4070404@swg.it
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in 8.3.3 Documentation / F.34.Xml2 the Deprecation notice claims:
"..the core server now covers XML syntax checking and XPath queries,
which is what Xml2 does, and more."

I can't get boolean values out from function "xpath". I think there is a
missing implementation of xpath syntax.

Try for example:
select xpath('false()',xml('<root/>'));
select xpath('1=1',xml('<root/>'));
select xpath('boolean(WHATEVERYOUWANT)',xml('<root/>'));

We have to keep in mind that xpath queries can return 4 value types:
integer, string, boolean and nodeset.
The previous Xml2 implementation was way more comfortable (functions:
xpath_number, xpath_string, xpath_bool and xpath_nodeset).

Thank you

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