{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://cdn.jsdelivr.net/npm/@pie-element/graphing@11.0.6/dist/schemas/session.schema.json",
  "type": "object",
  "properties": {
    "id": {
      "type": "string",
      "description": "Identifier of the session"
    },
    "element": {
      "type": "string",
      "description": "The element the session belongs to"
    },
    "answer": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Mark"
      },
      "description": "The marks the student drew"
    }
  },
  "description": "A student response",
  "definitions": {
    "Mark": {
      "type": "object",
      "properties": {
        "type": {
          "$ref": "#/definitions/MarkType",
          "description": "Indicates type of mark"
        },
        "building": {
          "type": "boolean",
          "description": "Indicates if mark is in build process"
        },
        "x": {
          "type": "number",
          "description": "Indicates x coordinate if type is point"
        },
        "y": {
          "type": "number",
          "description": "Indicates y coordinate if type is point"
        },
        "label": {
          "type": "string",
          "description": "Indicates label value for mark"
        },
        "showLabel": {
          "type": "boolean",
          "description": "Not read by this element or `@pie-lib/graphing`."
        },
        "from": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicates where starts the mark if type is line, segment, ray, vector"
        },
        "to": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicates where ends the mark if type is line, segment, ray, vector"
        },
        "middle": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Labelled midpoint of a line, ray, segment, vector, circle or polygon mark"
        },
        "root": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicated the root of mark if type is sine, parabola, absolute, exponential or circle"
        },
        "edge": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicated the edge of mark if type is sine, parabola, absolute, exponential or circle"
        },
        "closed": {
          "type": "boolean",
          "description": "Indicates if mark is closed if type is polygon, sine"
        },
        "points": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/MarkPoint"
          },
          "description": "Indicates all mark's points if type is polygon"
        }
      },
      "required": [
        "type"
      ]
    },
    "MarkType": {
      "type": "string",
      "enum": [
        "point",
        "segment",
        "line",
        "vector",
        "circle",
        "sine",
        "polygon",
        "ray",
        "parabola",
        "absolute",
        "exponential"
      ],
      "description": "Kind of mark a graphing tool draws."
    },
    "MarkPoint": {
      "type": "object",
      "properties": {
        "x": {
          "type": "number",
          "description": "Indicates x coordinate"
        },
        "y": {
          "type": "number",
          "description": "Indicates y coordinate"
        },
        "label": {
          "type": "string",
          "description": "Label shown next to the point"
        }
      },
      "required": [
        "x",
        "y"
      ],
      "description": "A point of a mark, labelled with the label tool."
    }
  }
}