"RoomPairTargetFilter": {
  "type": "object",
  "additionalProperties": false,
  "title": "RoomPairTargetFilter",
  "description": "Defines a target set as a pair of rooms. The pairs are defined as the cross product of two lists\nFrom and To.",
  "required": [
    "From",
    "To"
  ],
  "properties": {
    "From": {
      "title": "From",
      "anyOf": [
        {"$ref": "#/definitions/RoomNameList"},
        {"$ref": "#/definitions/RoomTypeList"}
      ]
    },
    "To": {
      "title": "To",
      "anyOf": [
        {"$ref": "#/definitions/RoomNameList"},
        {"$ref": "#/definitions/RoomTypeList"}
      ]
    }
  }
}

 "From": {
  "title": "From",
  "anyOf": [
    {"$ref": "#/definitions/RoomNameList"},
    {"$ref": "#/definitions/RoomTypeList"}
  ]
}

{"$ref": "#/definitions/RoomNameList"}

{"$ref": "#/definitions/RoomTypeList"}

 "To": {
  "title": "To",
  "anyOf": [
    {"$ref": "#/definitions/RoomNameList"},
    {"$ref": "#/definitions/RoomTypeList"}
  ]
}

{"$ref": "#/definitions/RoomNameList"}

{"$ref": "#/definitions/RoomTypeList"}