On 11/18/2011 1:30 PM, Karl Williamson wrote:
On 11/16/2011 07:25 AM, Asmus Freytag wrote:
The whole reason that some aspects of character encoding are "write
once" (can never be changed) is to prevent such obsolete data in
documents.
How is this different from Named sequences, which are published
provisionally?
Named sequences are a special case.
The sequence as such exists, whether or not a name is defined for it.
Therefore, ordinary users can go about their business creating documents
containing character sequences without needing to know whether a
sequence is named or not.
Those users (programmers) that use these names in place of identifiers
can be expected to understand what "provisional" means and to be aware
of the penalties for implementing them in ways that can't later be upgraded.
Perl should probably not support them in regex notation, for example.
So, in all respects, these act more like ordinary properties, for which
provisional information is already supported in the UCD. (Mostly for
Unihan).
A./
