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From: Jim Jones <[email protected]>
To: Andrey Borodin <[email protected]>
To: Marcos Magueta <[email protected]>
Cc: Kirill Reshke <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: WIP - xmlvalidate implementation from TODO list
Date: Sun, 4 Jan 2026 20:05:01 +0100
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAN3aFCdx8AapWSVpJ1kaC7OC_v7QwbjgbGw9WfPBBY2GMyOadQ@mail.gmail.com>
	<CALdSSPjxLU+zhWx+CgwN+VHoHTso33trY6mse1A6Jks7hWAdrA@mail.gmail.com>
	<CAN3aFCesNDiL-iZg4imC0n+NgT3JywqZYkuGH83u8ssLjJ-p5Q@mail.gmail.com>
	<CAN3aFCfvVgXr77o=dB_E2kSCY+EgckSQbSBdd_N9n-LauWuQLw@mail.gmail.com>
	<CAN3aFCcx_w5Ldb+SYurwd31es9hOJqLuKARQHHDOk7+5iOqBWQ@mail.gmail.com>
	<CALdSSPhFzYCp=Aa8AAboz6TQaTmjWciQGfrEJQeOOO+0pD1GGw@mail.gmail.com>
	<[email protected]>
	<[email protected]>

Hi!

On 04/01/2026 10:46, Andrey Borodin wrote:
> So you need to update src/test/regress/expected/xml_1.out for systems without libxml.

+1

There is also a xml_2.out. I don't really remember why it exists, but in
your case copying the changes from xml.out will most likely do the trick.

I am wondering whether passing the XML schema in every query is really
the right approach here. My main concern is that making the schema fully
user-controlled at execution time could lead to unwanted CPU or memory
usage -- not to mention the usability aspect of it. A catalog-level
schema registration mechanism would IMHO be a better fit, and it's also
supported by the SQL/XML standard:

"11.5 <XML valid according to clause>

Format

...
<XML valid according to identifier> ::= ID <registered XML schema name>
...

Syntax Rules

1) If <XML valid according to identifier> is specified, then the
<registered XML schema name> shall identify a registered XML schema RXS...
"

DB2 handles this similarly via REGISTER XMLSCHEMA.[1]

Thanks for working on this!

Best, Jim

[1] https://www.ibm.com/docs/en/db2/11.5.x?topic=commands-register-xmlschema

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