RE: BUG #15908: Xpath operations fail

Hi all,

Thank you for your responses.

Best,
Rick

From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Sent: Thursday, July 18, 2019 4:27 PM
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Daniel Gustafsson <daniel(at)yesql(dot)se>; Rick Vincent <rvincent(at)temenos(dot)com>; Herve Aubert <haubert(at)temenos(dot)com>; PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org>
Subject: Re: BUG #15908: Xpath operations fail

čt 18. 7. 2019 v 16:22 odesílatel Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us<mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us>> napsal:
Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com<mailto:pavel(dot)stehule(at)gmail(dot)com>> writes:
> čt 18. 7. 2019 v 15:06 odesílatel Daniel Gustafsson <daniel(at)yesql(dot)se<mailto:daniel(at)yesql(dot)se>>
> napsal:
>> I haven’t heard of anyone working on that, and it seems unlikely to happen
>> within the near future as few, if any, libraries support XPath 2.0 (or
>> later).

> Only XPath 1.0 is supported by libxml2. And this library is in permanent
> feature freeze mode :-(. Unfortunately, there is not any other library with
> friendly licence available for C language.

Not only that, but libxml2 is a rich source of security bugs. I wish
we could get rid of that dependency altogether. Unfortunately,
reimplementing our own xml and xpath functionality from scratch
seems like a large project :-(. I don't think there's anybody
with sufficient time and interest to do it.

Maybe some C++ or Java library with good licence can be ported to C for usage in Postgres.

But it is lot of work.

Pavel

regards, tom lane

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