Elements cannot be described more than once in DTD, right ?

Pavel Velikhov pvelikho at cs.ucsd.edu
Wed Sep 22 07:57:24 BST 1999

Sebastien Sahuc wrote:
> Hello,
> I have an element (<operations>) than can have different set of sub
> element. How can I describe it in DTD ?
> For example :
> <affiliate>
>   <operations>
>     <get/>
>     <set/>
>   </operations>
> </affiliate>
> and :
> <merchant>
>   <operations>
>     <signup/>
>   </operations>
> </merchant>
> How can I express in DTD that affiliate operations in 'set' and 'get',
> and that merchant has only the 'signup' ?

You cannot. This is a fundamental problem with DTDs, you will have to
operations as (get|set|signup). XSchema can get around this problem.
It is interesting to find out whether this is a serious problem for you,
something that you can get around/tolerate.

Pavel Velikhov

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