{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://fdc3.finos.org/schemas/next/context/chart.schema.json",
  "type": "object",
  "title": "Chart",
  "description": "A context type representing details of a Chart, which may be used to request plotting of a particular chart or to otherwise share details of its composition, such as:\n\n- A list of instruments for comparison\n- The time period to plot the chart over\n- The style of chart (line, bar, mountain, candle etc.)\n- Other settings such as indicators to calculate, or data representing drawings and annotations.\n\nIn addition to handling requests to plot charts, a charting application may use this type to output a representation of what it is currently displaying so that it can be recorded by another application.",
  "allOf": [{
      "type": "object",
      "properties": {
        "type": { "const": "fdc3.chart" },
        "instruments": {
          "title": "Instruments to plot",
          "description": "An array of instrument contexts whose data should be plotted.",
          "type": "array",
          "items": {
            "$ref": "instrument.schema.json#"
          }
        },
        "range": {
          "title": "Time Range",
          "description": "The time range that should be plotted",
          "$ref": "timeRange.schema.json#"
        },
        "style": {
          "title": "Chart style",
          "description": "The type of chart that should be plotted",
          "type": "string",
          "enum": [	"line", "bar", "stacked-bar", "mountain", "candle", "pie", "scatter", "histogram", "heatmap", "custom"]
        },
        "otherConfig": {
          "title": "Other configuration",
          "description": "It is common for charts to support other configuration, such as indicators, annotations etc., which do not have standardized formats, but may be included in the `otherConfig` array as context objects.",
          "type": "array",
          "items": {
            "$ref": "context.schema.json#"
          }
        }
      },
      "required": ["instruments"]
    },
    { "$ref": "context.schema.json#/definitions/BaseContext" }
  ],
  "examples": [
    {
      "type": "fdc3.chart",
      "instruments": [
          {
              "type": "fdc3.instrument",
              "id": {
                  "ticker": "AAPL"
              }
          },
          {
              "type": "fdc3.instrument",
              "id": {
                  "ticker": "GOOG"
              }
          }
      ],
      "range": {
          "type": "fdc3.timeRange",
          "startTime": "2020-09-01T08:00:00.000Z",
          "endTime": "2020-10-31T08:00:00.000Z"
      },
      "style": "line",
      "otherConfig": [
          {
              "type": "somevendor.someproduct.indicator",
              "name": "stddev",
              "parameters": {
                  "period": 10,
                  "matype": "exponential"
              }
          },
          {
              "type": "someothervendor.someotherproduct.formula",
              "formula": "standard-deviation",
              "fields": {
                  "lookback": 10,
                  "type": "ema"
              }
          }
      ]
    }
  ]
}