Обсуждение: More clearly on XML namespaces inside xpath function

Thanks, applied.

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Nikolay Samokhvalov wrote:
> Explain how to deal with XML namespaces inside the "xpath" function
> (especially about "default" namespaces, what is really unclear at first
> glance).
>
>
> Index: func.sgml
> ===================================================================
> RCS file: /projects/cvsroot/pgsql/doc/src/sgml/func.sgml,v
> retrieving revision 1.516
> diff -u -r1.516 func.sgml
> --- func.sgml 3 Jun 2010 14:40:42 -0000 1.516
> +++ func.sgml 4 Jun 2010 09:48:44 -0000
> @@ -8596,8 +8596,11 @@
>      mappings.  This array should be a two-dimensional array with the
>      length of the second axis being equal to 2 (i.e., it should be an
>      array of arrays, each of which consists of exactly 2 elements).
> -    The first element of each array entry is the namespace name, the
> -    second the namespace URI.
> +    The first element of each array entry is the namespace name (alias),
> the
> +    second the namespace URI. It is not required that aliases provided in
> +    this array are the same that those being used in the XML document
> itself (in
> +    other words, both in the XML document and in the
> <function>xpath</function>
> +    function context, aliases are <emphasis>local</>).
>     </para>
>
>     <para>
> @@ -8612,6 +8615,19 @@
>  (1 row)
>  ]]></screen>
>     </para>
> +
> +   <para>
> +    How to deal with default (anonymous) namespaces:
> +<screen><![CDATA[
> +SELECT xpath('//mydefns:b/text()', '<a xmlns="http://example.com
> "><b>test</b></a>',
> +             ARRAY[ARRAY['mydefns', 'http://example.com']]);
> +
> + xpath
> +--------
> + {test}
> +(1 row)
> +]]></screen>
> +   </para>
>    </sect2>
>
>    <sect2 id="functions-xml-mapping">

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + None of us is going to be here forever. +