Added as a base of primary child Element Type(s):
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Note: base/heir relation between Element Types is introduced by DocFlex. It is similar to the inheritance relation between Java classes. When an Element Type is used as a base for another Element Type (a heir), the last inherits from the former all its child Element Types and all its attributes. This is especially useful when Element Types represent some Java classes.

This notion is different from the parent/child relationship used in XML (and by DocFlex as well), where parent is an Element Type whose instances may contain elements of a child Element Type.