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Re: schema & polymorphism - resolving duplicate element defini

• To: "Chris Hoehn" <chris@h...>
• Subject: Re: schema & polymorphism - resolving duplicate element definitions
• From: ht@c... (Henry S. Thompson)
• Date: 16 Feb 2002 11:41:22 +0000
• Cc: <xml-dev@l...>
• In-reply-to: <NEBBLAIKMMGLFCFKOBJLIEAACPAA.chris@h...>
• References: <NEBBLAIKMMGLFCFKOBJLIEAACPAA.chris@h...>
• User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Civil Service)

"Chris Hoehn" <chris@h...> writes:

> I've got two schemas, A & B, that each define an element named EltC.  A and
> B both use the same targetNamespace. A and C are both defined by a
> "standards body" so I do not want to modify their definitions.
> 
> If I want to create another schema, Z,  which aggregates A & B (i.e. A & B
> are children in Z), I have the problem of a duplicate definition of EltC.  I
> have, to this point, tried creating Z by <include> or <import> of A & B.
> Both of which give the problem of a duplicate definition.  This seems so be
> an issue of polymorphism to me.
> 
> My question is... how can I properly <import> (or <include>) A & B in Z such
> that there is not this definition conflict?  Is this even possible if A & B
> have the same targetNamespace value?

Well, there's really nothing W3C XML Schema can do to help you.
You've got conflicting definitions, and the authors of A & B went out
of their way to make it impossible for you to fix the problem
non-intrusively.

To see why it's hard, think about what you want the _result_ (Z) to
validate for EltC instances, given the contradiction.  Which one wins,
if either?  The schema processor can't read your mind here, alas.

ht
-- 
  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@c...
		     URL: http://www.ltg.ed.ac.uk/~ht/

• References:
  • schema & polymorphism - resolving duplicate element definitions
    • From: "Chris Hoehn" <chris@h...>

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