23. The method of claim 21, including attributing a relevance value of strongly relevant to an attribute relevant to all entities of the node focus.
21. The method of claim 16, including displaying as a node focus the highest level node in the node hierarchy that a user chooses as start point for exploration; displaying to the user the attributes and their relevant attribute values for the node focus and allowing the user to select at least one of the attributes; and selecting a new node focus based on the at least one attribute selected by the user.