Re: Document NULL

> On Jan 30, 2026, at 10:16, David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
>
> On Thu, Jan 29, 2026 at 2:18 PM David G. Johnston <david(dot)g(dot)johnston(at)gmail(dot)com> wrote:
> Thank you for the review. My bad on these. I'm working through all the examples again to get them cleaned up properly.
>
> v11 with the examples work as a separate patch over v10 to be squashed.
>
> Tried to be consistent on "Title Case" within headers other than a few where the all-caps operator really made the most sense.
> Got NULL for SQL null literals throughout and Null for psql display of the same.
> Removed abbreviations in titles generally. Re-worked a couple of the more complex ones.
>
> Decided to leave my agent instructions in place (xml-styled comment). The flow actually worked pretty well, though it's nuanced enough to be wary of false-negatives. Hopefully I got them all.
>
> David J.
>
> <v11-0002-Update-all-examples.patch><v11-0001-doc-Provide-an-overview-of-NULL-handling.patch>

I failed to build v11:

```
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
^
nullvalues.sgml:1206: parser error : chunk is not well balanced

^
ddl.sgml:171: parser error : Entity 'nullvalues' failed to parse
&nullvalues;
^
ddl.sgml:5871: parser error : chunk is not well balanced

^
postgres.sgml:105: parser error : Entity 'ddl' failed to parse
&ddl;
^
make: *** [postgres-full.xml] Error 1
```

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/