Re: ArchForms and LPDs

From: Tim Bray <tbray@textuality.com>
To: John Cowan <johnwcowan@gmail.com>
Date: Sat, 31 Jul 2021 13:54:43 -0700

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On Fri, Jul 30, 2021 at 3:04 PM John Cowan <johnwcowan@gmail.com> wrote:

Well, it was originally the *creating* system that is supposed to NFC-normalize, and neither the receiving system nor a retransmitting system. But that has never applied to XML or HTML, and as a systems property is too hard to manage. So you should normalize just in case you need to compare: it's not normalization but equality under normalization that really matters.

Um… be very careful with that. Normalization is a can of worms that can lead to surprising results. Many protocols that base themselves on Unicode explicitly forbid normalization and define equality in terms of codepoint-by-codepoint comparison.

I can see using normalization in a data-acquisition UI or database search interface but it's hard to imagine many other situations where it would make sense. Use the bits you've received over the wire, don't [expletive deleted] with them.

One you've looked at normalization you're on a slippery slope that could lead to (*gasp* *shudder*) case-folding. And you definitely don't want to go there.

References:
- Summary of critiques of XML Namespace from comments to James Clark2010 blog
  - From: Rick Jelliffe <rjelliffe@allette.com.au>
- Re: Summary of critiques of XML Namespace from comments toJames Clark 2010 blog
  - From: Marcus Reichardt <u123724@gmail.com>
- ArchForns and LPDs
  - From: Arjun Ray <arayq2@gmail.com>
- Re: ArchForns and LPDs
  - From: Marcus Reichardt <u123724@gmail.com>
- Re: ArchForms and LPDs
  - From: Arjun Ray <arayq2@gmail.com>
- Re: ArchForms and LPDs
  - From: "Liam R. E. Quin" <liam@fromoldbooks.org>
- Re: ArchForms and LPDs
  - From: Rick Jelliffe <rjelliffe@allette.com.au>
- Re: ArchForms and LPDs
  - From: John Cowan <johnwcowan@gmail.com>

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