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5.3 Constructor Functions for User-Defined Types The spec currently say: "Consider a situation where the static context contains a type called hatSize defined in a schema whose target namespace is bound to the prefix my. In such a case the constructor function: my:hatSize($arg as xdt:anyAtomicType) as my:hatSize" replace the signature to my:hatSize($arg as xdt:anyAtomicType?) as my:hatSize?
Signature corrected. Thanks! Ashok Malhotra