InvalidDatatypeValueException getting to the root exception

[RefuX Zanzeebarr]

My next problem with my 'wanting to use schema validation for UI validation' 
is a problem with the invalid data. The real problem is that 
InvalidDatatypeValueException is not always the correct one, for example in 
org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl when validating facets with 
type union any validation errors actually caught disgarded since they 
(technically) are not significant since only the net result of an exception 
with cvc-datatype-valid.1.2.3 really matters.
However for me having the root validation error would be incredibly useful 
since then I can have a much more detailed error message.
As you can gather I'm not particulalry familiar with xerces, how easy would 
it be to replace the org.apache.xerces.impl.dv.xs.XSSimpleTypeDecl 
implementation with my own so I can extend it to capture the additional 
InvalidDatatypeValueExceptions?
Hopefully just some property needs changing :)


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