Thanks.

Shlomo.

-----Original Message-----
From: Michael Kay [mailto:mike@s...] 
Sent: =E2 17 =E0=F4=F8=E9=EC 2007 14:11
To: Shlomo Yona; 'Henry S. Thompson'
Cc: xmlschema-dev@w...
Subject: RE: Determinization in case of ambiguity or Should XML =
validators report on schemas that violate the UPA constraint?

> 
> I had another example where an xsd:sequence with an implied 
> minOccurs="1" and maxOccurs="1" contains particles with =
minOccurs="0".
> What is the expected behavior when none of these particles 
> appear in an XML instance?

It's quite valid to have a sequence with minOccurs="1" that contains =
an
element with minOccurs="0". Conceptually it means that the sequence =
must
occur, but if all the elements within the sequence are optional, then =
the
sequence is allowed to be empty. Of course in an instance document you =
can't
tell the difference between an empty sequence and an absent sequence, so =
you
might as well have written minOccurs="0" on the whole sequence, but in =
the
grammar they are subtly different.

Michael Kay
http://www.saxonica.com/



From esirois@c... Wed Apr 18 01:35:32 2007
Received: from maggie.w