As a developer, I want to develop utility functions, so I can develop the bundle closure algorithms more easily.
Acceptance Criteria
[ ] Have API for constructing arbitrary class expressions (empty, universal, singleton, union, intersection, complement, difference)
[ ] Have API for graph operations that transform a arbitrary taxonomy of class expressions into a tree whose taxonomic relations are implied by the original taxonomy
User Story
As a developer, I want to develop utility functions, so I can develop the bundle closure algorithms more easily.
Acceptance Criteria