20. The computer-readable medium of claim 17 , wherein the geographic data set is a tree structure wherein different positions in the tree structure that share a same level correspond to different geographic locations that share a same geographic region type.
20. The computer-readable medium of claim 17 , wherein the geographic data set is a tree structure wherein different positions in the tree structure that share a same level correspond to different geographic locations that share a same geographic region type. 24. The computer-readable medium of claim 20 , wherein determining that the geographic entity name and the second geographic entity name have a particular relationship in a geographic data set comprises determining that a second position for the second geographic entity name in the tree structure is an ancestor of a first position for the first geographic entity name in the tree structure.