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I am making a xml for a survey taken by students in a class. My dtd of responses looks like this:

<!DOCTYPE responses [
<!ELEMENT responses (student)+>
<!ELEMENT student (response?)>
]>

This model requires at least one student which will either have or not have a response.

Is there a way to require at least one student who has a response?

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Hello indieman, please don't cross-post. (Same question on SO.) Questions that would be better off on a different site will be migrated by the community or moderators when necessary. (You'll be able to request that through flags once you have the required rep.) – Mat Dec 2 '12 at 14:11
Please read the faq about what is on-topic here: this isn't directly about databases at all. – Jack Douglas♦ Dec 2 '12 at 19:39

closed as off topic by Jack Douglas♦ Dec 2 '12 at 19:39

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