Re: ID_Start, ID_Continue, and stability extensions

From: Markus Scherer <markus.icu_at_gmail.com>
Date: Thu, 24 Apr 2014 13:56:22 -0700

On Thu, Apr 24, 2014 at 12:56 PM, Steffen Nurpmeso <sdaoden_at_yandex.com>wrote:

> Markus Scherer <markus.icu_at_gmail.com> wrote:
> |I strongly recommend you parse the derived properties rather than trying
> to
> |follow the derivation formula, because that can change over time.
>
> ..this file includes only those core properties that have
> themselves a derivation-may-change property?
>

I don't know what that means.

What I tried to say is, if you need ID_Start, then parse ID_Start from
DerivedCoreProperties.txt. That's more stable (and easier than parsing the
pieces and deriving

# Lu + Ll + Lt + Lm + Lo + Nl
# + Other_ID_Start
# - Pattern_Syntax
# - Pattern_White_Space

yourself.

For example, at least one of the derivation formulas (for Alphabetic) is
changing from 6.3 to 7.0.

markus

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Received on Thu Apr 24 2014 - 15:57:27 CDT

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