Re: Re: [HACKERS] XQuery orXPathサポート

> On 3/5/07, Tatsuo Ishii <ishii@postgresql.org> wrote:
> > From: "Nikolay Samokhvalov" <samokhvalov@gmail.com>
> > > 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?
>
> "Mine" is supposed to go to the core. And, contrib/xml2 contains less
> "semantically clear" functions, that were developed for practical
> purposes (e.g. xml_number() returns only one, first number from the
> suquence).

I see.

> > > 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?
>
> Of course. Peter's patches are partially based on the result of my
> SoC2006 work ("Initial XML support for PostgreSQL"). XPath patch was
> discussed with him and in -hackers, now I'm waiting for its review.

The XPath support is 1.0 or 2.0?
--
Tatsuo Ishii
SRA OSS, Inc. Japan