| From: | Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> |
|---|---|
| To: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
| Cc: | Marcos Pegoraro <marcos(at)f10(dot)com(dot)br>, Álvaro Herrera <alvherre(at)kurilemu(dot)de>, jian he <jian(dot)universality(at)gmail(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, Yugo NAGATA <nagata(at)sraoss(dot)co(dot)jp>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Eisentraut <peter(at)eisentraut(dot)org>, David Rowley <dgrowleyml(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Document NULL |
| Date: | 2026-01-30 05:30:44 |
| Message-ID: | ABB21B5C-C38C-4DC8-A7B9-FCE741BEFC3B@gmail.com |
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| Lists: | pgsql-hackers |
> On Jan 30, 2026, at 11:43, David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
>
> On Thu, Jan 29, 2026 at 8:28 PM Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com> wrote:
>
> chaol(at)ChaodeMacBook-Air sgml % make html
> /usr/bin/xmllint --nonet --path . --path . --output postgres-full.xml --noent --valid postgres.sgml
> nullvalues.sgml:735: parser error : StartTag: invalid element name
> s | t | Stored = Stored | Stored < Constructor | Stored = Constructor
>
>
> I had actually caught that failure to use an < entity, but missed doing a git add....
>
> Anyway, v12 with the approach I prefer...using CDATA to avoid having to perform entity substitution.
>
> David J.
> <v12-0001-doc-Provide-an-overview-of-NULL-handling.patch><v12-0002-Update-all-examples.patch>
V12 passed the building.
My only comment on v12 is:
```
- Boolean (true/false) results.
+ <link linkend="nullvalues">three-valued</link> boolean typed
```
I think it’s better to use capital “B” for “boolean”. See [1].
[1] https://postgr.es/m/2508109.1769050728@sss.pgh.pa.us
Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/
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