SourceForge : artf6319: Compare xsd:choice and XSD Substitution Groups

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Artifact artf6319 : Compare xsd:choice and XSD Substitution Groups

Tracker:	Activity schema
Title:	Compare xsd:choice and XSD Substitution Groups
Description:	OGF26 discussion (Donal) pointed out that the original reasons for using substitution groups may be outdated. This should be checked again, with special attention whether xsd:choice is a viable alternative.
Submitted By:	Alexander Papaspyrou
Submitted On:	06/05/2009 11:09 AM EDT
Last Modified:	07/29/2009 8:17 AM EDT
Closed:	07/29/2009 8:17 AM EDT

	Status / Comments		Change Log		Associations		Attachments

Status
Group: *
Status:*	Closed
Category: *
Customer: *
Priority: *	4
Assigned To: *	Alexander Papaspyrou
Reported in Release: *
Fixed in Release: *
Estimated Hours: *	0
Actual Hours: *	0

Comments

Alexander Papaspyrou: 07/29/2009 8:17 AM EDT
	Comment:	Group discussion led to the decision to keep the substitution group way, since open extensibility is what should be expressed.
	Action:	Update Closed set to 07/29/2009 Status changed from Resolved to Closed

Alexander Papaspyrou: 07/29/2009 5:23 AM EDT

Comment:

Nowadays, the usage of xsd:choice should be no problem for fairly current implementations. As such, it should be discussed which semantics fit more 
precisely the needs of the positions. 

The main difference between the two from a structural point of view is that
- XSD substitution groups behave like classes and subclasses, allowing unlimited extensibility, while
- xsd:choices behave like enumerations, ensuring a finalized group of possible alternatives.

Action:

Update
Status changed from Pending to Resolved

Alexander Papaspyrou: 06/10/2009 4:03 AM EDT
	Action:	Update Status changed from Open to Pending

Alexander Papaspyrou: 06/05/2009 11:09 AM EDT
	Action:	Create

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