json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "RoutineOutline",
      "description": "A squash training routing containing many activities. Activities are stored as references to Activity ids.",
      "type": "object",
      "properties": {
          "id": {
              "description": "Unique identifier for the routine.",
              "type": "string"
          },
          "name": {
              "description": "Name of the routine.",
              "type": "string"
          },
          "activities": {
              "description": "List of activities in the routine.",
              "type": "array",
              "minItems": 1,
              "items": {
                  "type": "object",
                  "properties": {
                      "id": {
                          "description": "id of the activity.",
                          "type": "string"
                      },
                      "time": {
                          "description": "Time in seconds that the activity should run.",
                          "type": "number",
                          "minimum": 1
                      }
                  },
                  "required": [
                      "id",
                      "time"
                  ]
              }
          }
      }
  }