Tree that describes a balanced decomposition of another tree, according to its topology. More precisely, given a restricted multilevel partition for a tree T, a topology tree satisfies the following: (1) A topology tree node at level l represents a vertex cluster at level l in the restricted multilevel partition, and (2) A node at level l ≥ 1 has at most two children, representing the vertex clusters at level l-1 whose union gives the vertex cluster the node represents.