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"Most object-oriented languages do not support the full scope of inheritance defined by the XML schema specification. For this reason, you should use type inheritance in schemas with care."
 
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Hi!
XML schema allows two types of inheritance; extension and restriction.
Extension is easy to accomplish in, for instance Java, or some other OO language: Just add new fields to the subtype.
Restriction is slightly more complicated, since you cannot remove fields from a superclass in a subclass.
It is possible to override any getters and setters for a field to be removed and make them do nothing, but the field is still there.
Best wishes!
 
It is sorta covered in the JavaRanch Style Guide.
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