NestedIntegerValue is only partially implemented
The type saxon:nestedIntegerValue is partially implemented. It validates values of the form 123.45.00.1. It was implemented to meet a practical need and as an experiment in schema extensibility, but it is not well tested and supported. For example, there is no alpha code allocated, and there are plenty of places in the code that assume the 19 built-in primitive types of XSD, even though the XSD specification permits extensions.
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