IGraphGetVertices Method

Return an iterable to all the vertices in the graph. If this is not possible for the implementation, then an NotSupportedException can be thrown.

Return an iterable to all the vertices in the graph that have a particular key/value property. If this is not possible for the implementation, then a NotSupportedException can be thrown. The graph implementation should use indexing structures to make this efficient else a full vertex-filter scan is required.