DTD design

[Vincent PHAM]

 Does it match your need ?

 <!ELEMENT E ( EMPTY | ((A|B|C|X)?, (A|B|C|X)?) )>

  Vincent PHAM.

--- heiko.grussbach at crpht.lu a écrit:
> 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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