]> 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 X that is a superclass of class Y (Y is_a X), a statement is made about the corresponding Term individuals, asserting that the Term of X has a subProperty with the value of the Term of Y. Given subProperty and superProperty properties, it is possible to take an arbitrary Term and reconstruct the original heirarchy by doing HTTP GET operations.