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RE: DTD design

• From: "Sajeev M." <Sajeev_M1@v...>
• To: xml-dev@i...
• Date: Wed, 22 Dec 1999 16:07:20 +0530

hi ,

  it can be 
        <!ELEMENT E (EMPTY |((A|B|X)?,(A|B|X)?)
)>

since you wanted A,B and X to be optional.
> ----------
> From: 	heiko.grussbach@c...[SMTP:heiko.grussbach@c...]
> Reply To: 	heiko.grussbach@c...
> Sent: 	Wednesday, December 22, 1999 3:41 PM
> To: 	xml-dev@i...
> Subject: 	DTD design
> 
> Hi,
> 
> I have the following problem, I want to define an element E that may
> contain elements A,B,C. Order should be insignificant and A,B and C are all
> optional. Furthermore, A,B and C may each be replaced by X.
> The first example was simply like this:
> 
> <!ELEMENT E (
>      ( A?, B? ) |
>      ( B?, A? ) |
>      ( A?, X? ) |
>      ( B?, X? ) |
>      ( X?, A? ) |
>      ( X?, B? ) |
>      ( X?, X? )
> ) >
> 
> My XML-editor (XMetal 1.2) reports an ambigous content model error. After
> carefully studying the appendix of the XML rec, and with some help
> by the support of XMetaL , I came up with the following:
> 
> <!ELEMENT E (EMPTY |(A,(B|X)?) |(B,(A|X)?) |(X,(A|B|X)?)
> )>
> 
> Is this the best solution?, What if there are more childs, like A,B,C,D etc.
> Wouldn't the DTD just explode?
> 
> Regards
> 
> Heiko Grussbach
> 
> 
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