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Editorial Team
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Asked: 2026-06-13T23:06:10+00:00

I have a DTD with the following element definition <!ELEMENT a EMPTY> <!ELEMENT b

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I have a DTD with the following element definition

<!ELEMENT a EMPTY>
<!ELEMENT b EMPTY>

Is the following XML valid based on this DTD:

<a><b></b></a>
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1 Answer

  1. Editorial Team

    No, that would not be valid. An empty element can not contain any children. This includes the following types of nodes: text, element, comment, and processing instruction. The element could have attributes if they were defined.

    It would be valid if you changed EMPTY to ANY or b in the declaration for a:

    <!DOCTYPE a [
<!ELEMENT a ANY>
<!ELEMENT b EMPTY>
]>
<a><b></b></a>
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