A topological primitive represents a single non-decomposable element of topology and its
relationships to other topological primitives within a topological complex. The two topological
primitives relevant for temporal information are the node, which is 0-dimensional, and the edge, which
is one-dimensional. In the temporal schema, these are represented by two subclasses of
TM_TopologicalPrimitive: TM_Node and TM_Edge (Figure 9). When an application includes
information about temporal position as well as connectivity, a TM_TopologicalPrimitive may be
associated with a TM_GeometricPrimitive of the same dimension.