Suppose you have
<restriction type="int">
<pattern value="[0][0][0-9]+"/>
</restriction>
Clearly "001" is allowed by this definition. Is "1" also?
- If the answer is yes, then I don't know how to implement this. This would
require that to check a string s you must determine whether there is a
string s' such that s' matches the pattern and s and s' denote the same
value.
- If the answer is no, then this is not a restriction on the value space,
because "1" and "001" correspond to the same value, but have one is allowed
and the other is not.
----- Original Message -----
From: "Kohsuke KAWAGUCHI" <>
To: <>
Sent: Tuesday, May 08, 2001 7:19 AM
Subject: Re: Issue: overlapping with XML Schema Part 2
...
> 2. pattern (it says it applies to the value space, but I think this is
> unimplementable except for datatypes derived from string; the only way I
can
> see to implement it is to treat it as restricting the lexical space)
Actually, it says "pattern is a constraint on the value space of a
datatype which is achieved by constraining the lexical space." So I
don't see any flaw here.
