{
 "Name": "Get related sub block key",
 "Description": "Get related sub block key of a given block key on \"DC Advanced Lenear Referencing System (ALRS) Route.\"",
 "Usage": "The \"getSubBlockKeyFromBlockKey\" operation returns related sub block key for a given block key for DC Roadways. It accepts Bloock Key.",
 "Input Parameters Description": {
  "blockKey     ": "     Block Key. cannot be blank."
 },
 "Return Value Description": {
  "subBlocks": {
   "subBlockKey": "Unique sub-block key",
   "subBlockId": "Sub Block Id",
   "routeId": "Route Id of the sub-block",
   "fromMeasure": "Start measure of the sub-block (METERS)",
   "toMeasure": "End measure of the sub-block (METERS)",
   "routeName": "Name of the selected route",
   "routeType": "Type of the selected route",
   "fromSubBlock": "From sub-block intersection",
   "toSubBlock": "To sub-block intersection",
   "fromIntersectionId": "From sub-block intersection id",
   "toIntersectionId": "To sub-block intersection id",
   "fromIntersectionKey": "From sub-block unique intersection key",
   "toIntersectionKey": "To sub-block ubique intersection key",
   "directionality": "Traffic directionality of the sub-block",
   "blockId": "Corresponding block id, if it has a block",
   "blockKey": "Unique block key, if it has a block"
  }
 }
}