An ExpressionType defines the type of an Expression object. It uses a human readable string representation like "VER" (verb) or "OBJ" (object). Derived types like negative verbs are written in a concatenated form like "VER-NEG". ExpressionType objects are immutable. To alter expression types, there is always created a new ExpressionType object (similar to the immutable Java String class).
@author Martin Fuchs
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