draft-ietf-idnabis-tables-06a.txt (Substantive Problem 1)

[Kenneth Whistler]

Patrik,

> http://stupid.domain.name/stuff/draft-ietf-idnabis-tables-06a.txt

Now for some substantive problems, particularly in Appendix A.

First problem: 2nd paragraph of Appendix A.

"Script(cp) return the name of the Script cp is of, while
Class(cp) return the Class."

This sentence is full of problems.

1. Class(cp) is nowhere used in Appendix A, so it should be
deleted from this paragraph describing the pseudo code.
It may be a holdover from before the correction to
use the full property name Canonical_Combining_Class(cp).
If that is the intent, then it should instead describe
that particular property, rather than just an unspecified "Class".

2. Script(cp) is not specifically tied to any specification.
As stated right now people might assume it relies on
the Unicode Standard's Script property, but they might
also decide to determine script some other way, which
would make the specifications of the context rules
indeterminate. I suggest tightening this up to be
very specific about this referring to the Unicode
Script property, if that is indeed the intent here.

So a potentially much more rigorous rewrite would be:

"Script(cp) returns the value of the Unicode Script property,
as defined in Scripts.txt in the Unicode Character Database.
Canonical_Combining_Class(cp) returns the value of
the Unicode Canonical_Combining_Class property,
as defined in UnicodeData.txt in the Unicode Character
Database."

If stated that way, implementers will get determinant
values for the functions, and will all get the same
results when they attempt to evaluate these context rules.


Editorial: I noticed another instance of "FALSE" that should
change to "False" two sentences earlier in that same paragraph.

--Ken