How to declare empty or not-empty dtd element?

Yes, your element declaration for File is correct.

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I have found the *-operator, but I can't verify if this can also validate empty elements. I have tried this, but it gives a compilation error in Visual Studio saying that the EMPTY element is not declared: Or I could try the following, but I can't validate if it is ok: ... xml dtd link|improve this question asked Aug 17 '11 at 11:39Marnix2,8611313 94% accept rate.

Yes, your element declaration for File is correct: What you're saying is that File can contain zero or one Annotations element. Also, if you would've used * instead of? , you would've been saying File can contain zero or more Annotations elements.

Valid examples: > > .

That was my question actually... – Marnix Aug 17 '11 at 22:27 Yes. Zero means that you can have an empty element (element with no content). That really has nothing to do with an ending slash being on the same line.

XML editors and/or processors may treat line breaking differently. I've added a couple of examples. – DevNull Aug 17 '11 at 23:01 Thanks for the verification.

The examples are exactly what I was looking for. – Marnix Aug 22 '11 at 15:09.

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