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- From: "Sajeev M." <Sajeev_M1@verifone.com>
- To: xml-dev@ic.ac.uk
- 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@crpht.lu[SMTP:heiko.grussbach@crpht.lu]
> Reply To: heiko.grussbach@crpht.lu
> Sent: Wednesday, December 22, 1999 3:41 PM
> To: xml-dev@ic.ac.uk
> 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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