group_by

Link output is not limited to displaying a flat link list of cities or subdivisions or zip codes.  They can be combined using the group_by parameter to generate more interesting output: Possible group_by combinations are: group_by=”city,prop_type” group_by=”city,area” group_by=”city,subdivision” group_by=”area,prop_type” group_by=”subdivision,prop_type” group_by=”zip,prop_type”