json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "type": "object",
      "properties": {
          "additionalProperties": {
              "description": "name associated to the virtual machine and its properties (cost and resources)",
              "type": "object",
              "properties": {
                  "cost": {
                      "type": "integer"
                  },
                  "resources": {
                      "type": "object",
                      "properties": {
                          "additionalProperties": {
                              "description": "resource (as defined in ABS standard library) and its provided amount)",
                              "type": "integer"
                          }
                      }
                  }
              },
              "required": [
                  "cost",
                  "resources"
              ]
          }
      }
  }