Properties of Topological Measures on Classes of Subspaces of an Inner Product Space

We study topological measures on classes of subspaces of an inner product space. The existence of topological measures is discussed, and their relation to measures on orthoprojections from $\mathcal {B}(H)^{\mathrm{pr}}$ is considered, where $H$ is the completion of the inner product space in question. We also find properties of topological measures defined on classes of splitting and (co)complete subspaces of an inner product space.