Go Onix v3 Generation Generates Incomplete Models

[nikolawannabe]

Looking at the code generated for the objects in the v3 version of onix in Go, and trying to parse XML with said code, lots of properties are missing from this version that should be present.

https://github.com/kogai/onix-codegen/blob/main/generated/go/v3/model.go#L862 vs https://github.com/knakk/kbp/blob/master/onix/message.go#L2890 for example shows these fields missing:

 	RecordReference        RecordReference
	NotificationType       NotificationType
 	DeletionText           []DeletionText
 	RecordSourceType       *RecordSourceType
 	RecordSourceIdentifier []RecordSourceIdentifier
 	RecordSourceName       *RecordSourceName
 	ProductIdentifier      []ProductIdentifier
 	Barcode                []Barcode

I don't see anything immediately obvious with the XSD that would cause this problem, but I'm not an XSD expert by any means, unfortunately.