json_schema: {
      "title": "font",
      "type": "object",
      "$schema": "http://json-schema.org/draft-04/schema",
      "description": "Font used for text symbols.",
      "properties": {
          "decoration": {
              "type": "string",
              "description": "The text decoration.",
              "enum": [
                  "line-through",
                  "none",
                  "underline"
              ],
              "default": "none"
          },
          "family": {
              "type": "string",
              "description": "The font family."
          },
          "size": {
              "type": "number",
              "description": "The font size in points. Ignored when font is used on TextSymbol3DLayer."
          },
          "style": {
              "type": "string",
              "description": "The text style.",
              "enum": [
                  "italic",
                  "normal",
                  "oblique"
              ],
              "default": "normal"
          },
          "weight": {
              "type": "string",
              "description": "The text weight.",
              "enum": [
                  "bold",
                  "bolder",
                  "lighter",
                  "normal"
              ],
              "default": "normal"
          }
      },
      "additionalProperties": false,
      "esriDocumentation": {
          "examples": [
              {
                  "title": "font",
                  "code": {
                      "font": {
                          "family": "Arial",
                          "size": 12,
                          "style": "normal",
                          "weight": "bold",
                          "decoration": "none"
                      }
                  }
              }
          ]
      }
  }