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	Interface	Description
	IDataItem	This is the base interface of our data items, like nodes (vertices) and edges, it specifies ID and data properties.
	IEdge	The Edge interface for graph edges.
	IGraph	Interface to the Graph datastructure class that hold the set of nodes and edges that actually form that graph
	IGTree	interface to the GTree data structure that holds a spanning tree of the graph
	INode	Interface for the node (vertex) data structure.

	Class	Description
	Edge	Edge class that implements the IEdge interface an edge has an id, two nodes a potential data object and may be associated with an IVisualEdge
	Graph	Graph implements a graph datastructure G(V,E) with vertices V and edges E, except that we call the vertices nodes, which is here more in line with similar implementations.
	GTree	This class represents a spanning tree, rooted in the given root node of the connected component of the associated graph.
	Node	Implements the Node data structure, which is part of a graph.