json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "definitions": {
          "requirement": {
              "anyOf": [
                  {
                      "required": [
                          "minimum"
                      ]
                  },
                  {
                      "required": [
                          "maximum"
                      ]
                  }
              ],
              "properties": {
                  "minimum": {
                      "type": "integer",
                      "minimum": 0
                  },
                  "maximum": {
                      "type": "integer",
                      "minimum": 0
                  }
              }
          },
          "project-template": {
              "description": "A project's session template",
              "type": "object",
              "properties": {
                  "session": {
                      "type": "object"
                  },
                  "acquisitions": {
                      "type": "array",
                      "minItems": 1,
                      "items": {
                          "$ref": "#/definitions/requirement"
                      }
                  }
              },
              "additionalProperties": false
          }
      },
      "properties": {
          "requirement": {
              "$ref": "#/definitions/requirement"
          },
          "project-template": {
              "$ref": "#/definitions/project-template"
          }
      },
      "required": [
          "requirement",
          "project-template"
      ]
  }