"relationships" : [
  {
    "id" : 0, 
    "name" : "toCities", 
    "originLayerId" : 1, 
    "destinationLayerId" : 2, 
    "originPrimaryKey" : "OBJECTID_1", 
    "originForeignKey" : "OBJECTID_1", 
    "forwardPathLabel" : "", 
    "backwardPathLabel" : "", 
    "cardinality" : "esriRelCardinalityOneToOne", 
    "composite" : false
  }
]