On 23 Apr 2014, at 20:18, Markus Scherer <[email protected]> wrote:

> I strongly recommend you parse the derived properties rather than trying to 
> follow the derivation formula, because that can change over time.

No argument there!

My initial question can be rephrased as the following remark/change request:

http://unicode.org/reports/tr31/#Default_Identifier_Syntax  could make it more 
clear that “stability extensions” means `Other_ID_Start` and 
`Other_ID_Continue`, respectively. At the moment it lists an incomplete 
formula: it’s explicit about all the categories and properties to include to 
form `ID_Start` and `ID_Continue` _except for those_, for seemingly no good 
reason.

Regards,
Mathias
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