[boost] Boost.Graph - covering PropertyGraphConcept

I am trying to write a new type that covers some of the Graph concepts. I seem to be able to get most of the concepts covered except the PropertyGraph concept. I am having trouble figuring out the various types that are required (e.g., for property_map, etc.). Are there any straightforward examples of types that cover PropertyGraph and allow arbitrary (i.e., templated) types to be the vertex and edge properties? Thanks for your help. Cheers, Brook