]> A property representing the fact that a Term is related to another Term. During conversion from a heirarchical, class-based representation, each OBO Term in the heirarchy is represented as a Term, and for each of the classes Y that is a superclass of class X (Y is_a X), a statement is made about the corresponding Term individuals. Specifically, for each such superclass X (and its superclasses' superclasses, recursively), a statment is made, asserting that the Term of Y has a superProperty with the value of the Term of X. Given subProperty and superProperty properties, it is possible to take any arbitrary Term and reconstruct the original heirarchy by doing HTTP GET operations.