[DFDL-WG] DFDL & support for XML Schema 1.1

[Mike Beckerle]

Very good.
 
If these are the primary things in Schema 1.1, then this is a big help.
 
Question: if we drop unordered property so that we have xsd:sequence groups
and xsd:all groups, will we retain restrictions on nesting, i.e., can't nest
xsd:all inside an xsd:all, etc.
 
To me there's little or no downside to these restrictions because you can
always put an element "wrapper" around an xsd:all group which changes the
logical model, but in DFDL doesn't imply anything about the physical
representation, so it's not really a problem. 
 
I assume xsd:all will have the semantics of preserving the arrival order, so
it is much like an array of choice semantically. That is, the DFDL infoset
will have the items within the xsd:all group in the order they appear in the
physical data.
 
 
 
 
 

Mike Beckerle | OGF DFDL WG Co-Chair | CTO | Oco, Inc.
Tel:  781-810-2100  | 504 Totten Pond Road, Waltham MA 02451 |
<mailto:mbeckerle.dfdl at gmail.com> mbeckerle.dfdl at gmail.com 

 

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From: dfdl-wg-bounces at ogf.org [mailto:dfdl-wg-bounces at ogf.org] On Behalf Of
Steve Hanson
Sent: Wednesday, October 29, 2008 7:54 AM
To: dfdl-wg at ogf.org
Subject: [DFDL-WG] DFDL & support for XML Schema 1.1



Sandy Gao at IBM has looked at the reasons for moving to schema 1.1 and
concluded that DFDL should move. 

Grounds: 
- Weakened wildcard support - there is less ambiguity in 1.1 because an
optional element x followed by a wildcard will match x, instead of giving a
UPA error - this will enable DFDL to model more formats 
- Relaxation of <xs:all> means that it is suitable for DFDL use - this will
allow us to drop the dfdl:unordered property 
- In Schema 1.0, annotations are lost on particles, but they are needed by
DFDL. Schema 1.1 captures all annotations. 

Regards

Steve Hanson
Programming Model Architect
WebSphere Message Brokers
Hursley, UK
Internet: smh at uk.ibm.com
Phone (+44)/(0) 1962-815848 




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