json_schema: {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "title": "Note",
      "description": "Note with optional comments",
      "type": "object",
      "properties": {
          "author": {
              "type": "string"
          },
          "title": {
              "type": "string"
          },
          "content": {
              "type": "string"
          }
      },
      "patternProperties": {
          "^comment[1-9]$": {
              "type": "string"
          }
      },
      "additionalProperties": false,
      "required": [
          "author",
          "title",
          "content"
      ]
  }