Re: Re: [HACKERS] XQuery or XPathサポート

From: "Nikolay Samokhvalov" <samokhvalov(at)gmail(dot)com>
Subject: [HACKERS] Re: [HACKERS] XQuery or XPathサポート
Date: Mon, 5 Mar 2007 14:51:43 +0300
Message-ID: <e431ff4c0703050351v781c5602hfc0c6c9976b6b139(at)mail(dot)gmail(dot)com>

> On 3/5/07, Tatsuo Ishii <ishii(at)postgresql(dot)org> wrote:
> > Is there any plan for supporting XQuery or XPath in 8.3?
>
> I've submitted patch for simple XPath 1.0 support (based on libxml2):
> http://archives.postgresql.org/pgsql-patches/2007-03/msg00088.php

But contrib/README.xml2 stated:

"This version of the XML functions provides both XPath querying and
XSLT functionality"

What's the difference between yours and contrib/xml2?

> This function does XML parsing at query time. So, you should use
> functional indexes over this function to reach good perfromance.
>
> My curent plans include development of additional contrib module for
> alternative (experimental), efficient support of XPath (no XML parsing
> at query time), similar to Microsoft's ORDPATHs. This project is
> called "xlabel" and I hope to implement its prototype soon.

Also Peter seems to add xml datatype to 8.3. Does your functuion
handle this data type?
--
Tatsuo Ishii
SRA OSS, Inc. Japan