7. The method of claim 4 , further comprising downwardly and exhaustively traversing said hierarchy from said related data in said at least one predecessor group to a plurality of second related data in said plurality of descendant groups using said relationships among the data.
7. The method of claim 4 , further comprising downwardly and exhaustively traversing said hierarchy from said related data in said at least one predecessor group to a plurality of second related data in said plurality of descendant groups using said relationships among the data. 8. The method of claim 7 , wherein said building a context comprises building a context including said occurrence, said related data, and said plurality of second related data.