37. The system of claim 31 , wherein determining that the first search query includes a respective text reference to each of one or more attributes associated with entities of the first entity type comprises: determining that at least one term in the first search query appears in an attribute data store.
37. The system of claim 31 , wherein determining that the first search query includes a respective text reference to each of one or more attributes associated with entities of the first entity type comprises: determining that at least one term in the first search query appears in an attribute data store. 38. The system of claim 37 , wherein the attribute data store contains terms from previously submitted queries determined to relate to entities of the first entity type by a query classifier.