There is another element y
Yes There is no way to use XSD, so that I can make y mandatory when the value of x is b, and optional if the value of x is a.
It says:
In general, an element is required to appear when the value of minOccurs is 1 or more. The maximum number of times an element may appear is determined by the value of a maxOccurs attribute in its declaration . This value may be a positive integer such as 41, or the term unbounded to indicate there is no maximum number of occurrences. The default value for both the minOccurs and the maxOccurs attributes is 1.
Since the attribute value cannot be inferred from other schema content in XML Schema, you cannot achieve it (using XML Schema).
(I don’t know if Relax NG can do this, but you can investigate whether it Support this kind of content-dependent definition.)
In XSD, I have an element x with value (a,b)
There is another element y
Is there a way to use XSD so that I can make y mandatory when the value of x is b, and optional if the value of x is a.
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Look at XML Schema Part 0: P rimer Second Edition, section 2.2.1 Occurrence Constraints.
It says:
In general, an element is required to appear when the value of minOccurs is 1 or more. The maximum number of times an element may appear is determined by the value of a maxOccurs attribute in its declaration. This value may be a positive integer such as 41, or the term unbounded to indicate there is no maximum number of occurrences. The default value for both the minOccurs and the maxOccurs attributes is 1.
Because the attribute values cannot be inferred from other schema contents in XML Schema, you Not possible (using XML Schema).
(I don’t know if Relax NG can do this, but you can investigate whether it supports this content-dependent definition.)