From: | "Nikolay Samokhvalov" <samokhvalov(at)gmail(dot)com> |
---|---|
To: | PGSQL-Patches <pgsql-patches(at)postgresql(dot)org> |
Subject: | xpath_array with namespaces support |
Date: | 2007-02-20 23:46:33 |
Message-ID: | e431ff4c0702201546h2b0ce0bcn4da1363ede18aab1@mail.gmail.com |
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Lists: | pgsql-hackers pgsql-patches |
As a result of discussion with Peter, I provide modified patch for
xpath_array() with namespaces support.
The signature is:
_xml xpath_array(text xpathQuery, xml xmlValue[, _text namespacesBindings])
The third argument is 2-dimensional array defining bindings for
namespaces. Simple examples:
xmltest=# SELECT xpath_array('//text()', '<local:data
xmlns:local="http://127.0.0.1"><local:piece id="1">number
one</local:piece><local:piece id="2" /></local:data>');
xpath_array
----------------
{"number one"}
(1 row)
xmltest=# SELECT xpath_array('//loc:piece/@id', '<local:data
xmlns:local="http://127.0.0.1"><local:piece id="1">number
one</local:piece><local:piece id="2" /></local:data>',
ARRAY[ARRAY['loc'], ARRAY['http://127.0.0.1']]);
xpath_array
-------------
{1,2}
(1 row)
Thoughts regarding other XPath functions were exposed a couple of days
ago: http://archives.postgresql.org/pgsql-patches/2007-02/msg00373.php
If there is no objections, we could call the function provided in this
patch as xpath() or xmlpath() (the latter is similar to SQL/XML
functions).
Also, maybe someone can suggest better approach for passing namespace
bindings (more convenient than ARRAY[ARRAY[...], ARRAY[...]])?
--
Best regards,
Nikolay
Attachment | Content-Type | Size |
---|---|---|
xpath.w.namespaces.20070220.patch | text/x-patch | 9.9 KB |
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