From: | "Mike Rylander" <mrylander(at)gmail(dot)com> |
---|---|
To: | nikolay(at)samokhvalov(dot)com |
Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, pgsql-patches(at)postgresql(dot)org |
Subject: | Re: [PATCHES] xml2 contrib patch supporting default XML namespaces |
Date: | 2007-03-06 13:08:01 |
Message-ID: | b918cf3d0703060508q4585c1aehb1aa24423b63d8cb@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-patches |
On 3/6/07, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com> wrote:
> On 3/6/07, Mike Rylander <mrylander(at)gmail(dot)com> wrote:
> > Attatched you'll find a patch that I've been kicking around for a
> > while that I'd like to propose for inclusion in 8.3. I attempted to
> > submit this through the original xml2 author (as far back as the 7.4
> > days) but got no response.
> >
> > It's really fairly trivial, but I will be using the features it
> > provides in production soon, so I'd like to see it applied against the
> > contrib xml2 module. The patch adds support for default XML
> > namespaces in xml2 by providing a mechanism for supplying a prefix to
> > a named namespace URI. It then wraps the namespace-capable functions
> > in backward-compatible equivalents so that old code will not break.
>
> 1) And what about non-default namespaces?
I'm not sure I understand. If the namespace already has a prefix then
it works fine. This patch simply gives a known non-prefixed namespace
URI a prefix so one can write XPath that looks like
//marc:datafield[(at)tag='245']/marc:subfied[(at)code='a']
instead of
//*[local-name()='datafield' and
@tag='245']/*[local-name()='subfied' and @code='a']
A little two node example is painful enough, now imagine a non-trivial
example with backtracking conditionals... :P
> 2) What if my XPath query has different prefix, that also should be
> mapped to the same URI? (Not frequent case, but this really can occur
> -- e.g. XML doc has prefix 'local' for URI='http://127.0.0.1', but
> XPath should have 'loc' for the same URI.)
>
Both prefixes work fine as multiple prefixes can map to the same URI.
> --
> Best regards,
> Nikolay
>
--
Mike Rylander
mrylander(at)gmail(dot)com
GPLS -- PINES Development
Database Developer
http://open-ils.org
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