XSD: require attributes to have specific values?

You can enforce the first rule by declaring element be with minOccurs=4 and maxOccurs=4 like so: xs:element name="a.

You can enforce the first rule by declaring element be with minOccurs=4 and maxOccurs=4, like so: However, you can not use XSD to enforce the second rule. If you really want to do that, you can, for example, replace the 4 be elements with elements b1, b2, b3, and b4, each of which would implicitly represent the c attributes 1 through 4, respectively.

You can make a/b/@c a key with a global uniqueness constraint and then give an integer type with facets for min=1 and max=4. Still doesn't disallow 1, 3, 2, 4 though... – xan Feb 9 at 2:42.

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