This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
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.