Re: [ubl-lcsc] ISSUE: Nesting and Containership within Schema

[John Larmouth <j.larmouth@salford.ac.uk>]

You can specify that trivially if you use ASN.1 as the schema definition
notation:

	Root ::= SEQUENCE {
	   el1	.....
	   el2	SEQUENCE {
		  f1	..... OPTIONAL,
		  f2	..... OPTIONAL,
		  f3	..... OPTIONAL} (EXCEPT {}) OPTIONAL,
	   e12  ..... }

John L

"Eve L. Maler" wrote:
> 
> (Sorry to jump into this thread so late...  I've been out of the office.)
> 
> I don't know of a way to enforce this kind of constraint using XSD
> alone; I think we'd have to resort to something like Schematron, or
> prose, for it.
> 
>         Eve
> 
> CHIUSANO, Joseph wrote:
> > Also, in the schema you can enforce that if none of the elements within
> > a container appear (if they are all optional), then the container
> > (wrapper) element will not appear.  This would prevent empty container
> > elements if we didn't want to have them.
> 
> --
> Eve Maler                                        +1 781 442 3190
> Sun Microsystems                            cell +1 781 883 5917
> XML Web Services / Industry Initiatives      eve.maler @ sun.com
> 
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   Prof John Larmouth
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