• From: Rob Lugt <roblugt@e...>
• To: Steve Neely <sjn@1...>, xml-dev@l...
• Date: Fri, 10 Nov 2000 11:49:55 +0000

"Steve Neely" wrote:
>
> "Validity constraint: No Duplicate Types
> The same name must not appear more than once in a single mixed-
> content declaration."
> I interpret this as saying you cannot repeat a tag inside a mixed
> content declaration. So the following is not allowed:
>
> <AA>some text
>   <BB>Blah</BB>
>   some mixed content
>   <BB>more blah</BB>
> </AA>
>
> Why is this disallowed?

Your example is perfectly valid, but you do not need to declare BB twice.
The following declaration will suffice:-
<!ELEMENT AA (#PCDATA|BB)*>

Note the final "*" means that #PCDATA can be arbitrarily interspersed with
BB elements

Regards
Rob Lugt
ElCel Technology

• References:
  • Mixed content validity constraint
    • From: Steve Neely <sjn@1...>

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