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Alex Rivera
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I'm trying to set up part of a schema that's like a "Sequence" where all child elements are optional, but at least one of the elements must be present, and there could be more than one of them. I tried doing the following, but XMLSpy complains that "The content model contains the elements <element name="DateConstant"> and <element name="DateConstant"> which cannot be uniquely determined.": <xs:choice> <xs:sequence> <xs:element name="DateConstant"/> <xs:element name="TimeConstant"/> </xs:sequence> <xs:element name="DateConstant"/> <xs:element name="TimeConstant"/> </xs:choice> Can this be done (and if so, how)? Some clarification: I only want to allow one of each element of the same name. There can be one "DateConstant" and/or one "TimeConstant", but not two of either. Gizmo's answer matches my requirements, but it's impractical for a larger number of elements. Hurst's answer allows two or more elements of the same name, which I don't want.
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