L2/03-144

Subject: PropertyAlias Groupings
From: Mark Davis
Date: Fri, 2 May 2003 16:48:39 -0700

Please add this email to the doc registry and on the agenda.

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1. I just noticed that

age       ; Age
blk       ; Block

are listed in C:\DATA\UCD\4.0.0-Update\PropertyAliases-4.0.0.txt as
being "Non-enumerated Properties", which is really incorrect; they are
both enumerations. This should be fixed in 4.0.1. (Note: these are
only comments on the properties, and just informative.)

2. Also, in view of our development of the categorizations in the
Character Property TR, we may want to make further changes for
clarity. Property Aliases currently only has three groups:

Non-enumerated Properties
Enumerated Non-Binary Properties
Binary Properties

2a. We may want to pull the following out into a Numeric Properties
section:

nv        ; Numeric_Value

2b. Ken also suggests that we distinguish between Enumerated
Non-Binary Properties like Bidi_Class and those like Script, Age, or
Block:

> where for any particular
> version of Unicode there is an enumeration, but where there
> is no logical connection to an algorithm, and where the enumeration
> is an accumulation of items which, in principle, grows with
> each new version. These are *catalog* properties, rather than
> *logical enumeration* properties, and I think both the model
> and PropertyAliases.txt ought to distinguish them.