- From: TAMURA Kent <kent@trl.ibm.co.jp>
- Date: Mon, 10 Apr 2000 16:06:46 +0900
- To: www-xml-schema-comments@w3.org
- CC: kent@trl.ibm.co.jp
I have some comments on the regular expressions section in the
last call draft [1].
[1] http://www.w3.org/TR/2000/WD-xmlschema-2-20000407/#regexs
Re: The entire
It is hard to know concrete syntax of the regular expression
from the draft. I want readable rules like BNF.
Re: Character class subtraction
E.1:
> [Definition:] A character class subtraction is a character
> class expression subtracted from a positive character group or
> negative character group, using the - character.
This definition does not explain how to use '-'. The next
paragraph says "G-C is a valid character class subtraction", but
there are no restriction on other usages of '-', like "GC-", "-GC" :-)
Re: '-' in character range
A '-' in a character class has many meanings. So,
interpretation of '-' can be ambiguous. For example:
[+--/]
We can interpret this character class as:
a) '+' to '-', and '/'
b) '+', and '-' to '/'
Re: Definition of multi-character escape
"\w" is defined as "[�-]-[\p{P}\p{S}\p{C}]", but
both of � and  are invalid character references
in XML.
I don't know characters in 𐀀- should be in "\w".
--
TAMURA Kent @ Tokyo Research Laboratory, IBM
Received on Monday, 10 April 2000 03:07:26 UTC