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[Bug 28738] An empty choice is not emptiable

From: <bugzilla@jessica.w3.org>
Date: Tue, 02 Jun 2015 14:45:48 +0000
To: www-xml-schema-comments@w3.org
Message-ID: <bug-28738-703-HjYQjqCyqX@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=28738

--- Comment #1 from Michael Kay <mike@saxonica.com> ---
While on the subject, the definition of "minimum" in Schema Component
Constraint: Effective Total Range (choice) is ambiguous. It can be parsed as

(X) The product of 

(A) P.{min occurs} and 
(B) the minimum of the {min occurs} of every wildcard or element declaration
particle in G.{particles} and 
(C) the minimum part of the effective total range of each of the group
particles in G.{particles} (or 0 if there are no {particles}).

(In which case it's not clear what B is if there are no particles)

or as

(Y) The product of 

(A) P.{min occurs} and 
(B) (the minimum of 
   (i) the {min occurs} of every wildcard or element declaration particle in
G.{particles} and 
   (ii) the minimum part of the effective total range of each of the group
particles in G.{particles}) (or 0 if there are no {particles}).

I think that (Y) is intended.

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