"severity": {
          "description": "A map of diagnostic codes to their severity settings.",
          "default": {},
          "type": "object",
          "properties": {
            "syntax-error": { "$ref": "#/definitions/DiagnosticSeveritySetting" }, 
            "syntax-warning": { "$ref": "#/definitions/DiagnosticSeveritySetting" }
          },
          "additionalProperties": false
        }