Github user tellison commented on the issue:
https://github.com/apache/incubator-pirk/pull/17
Each element must occur once (i.e. minOccurs="1" maxOccurs="1") unless
stated differently, so we just need to add a minOccurs="0" to isArray to make
it optional, defaulting to true, so we can write <isArray/>.
I'll update this PR.
[It is also possible to define the set of allowed values for the <type>
element, but since that may contain a class name as well as the primitive
types, we can't usefully define it any better in the xsd.]
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