{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "$id": "https://cdn.jsdelivr.net/npm/@pie-element/graphing-solution-set@7.0.6/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": {
        "$ref": "#/definitions/Mark"
      },
      "description": "The lines the student drew and the section picked as the solution set"
    }
  },
  "description": "A student response",
  "definitions": {
    "Mark": {
      "type": "object",
      "properties": {
        "type": {
          "$ref": "#/definitions/MarkType",
          "description": "Indicates type of mark"
        },
        "building": {
          "type": "boolean",
          "description": "Indicates if mark is in build process"
        },
        "from": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicates where the line starts if type is line"
        },
        "to": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Indicates where the line ends if type is line"
        },
        "fill": {
          "$ref": "#/definitions/LineType",
          "description": "Line type of a line mark, copied from the line's `gssLineData` setting"
        },
        "points": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/MarkPoint"
          },
          "description": "Indicates all mark's points if type is polygon"
        },
        "closed": {
          "type": "boolean",
          "description": "Indicates if mark is closed if type is polygon"
        },
        "isSolution": {
          "type": "boolean",
          "description": "Indicates if a polygon mark is the selected solution set"
        },
        "middle": {
          "$ref": "#/definitions/MarkPoint",
          "description": "Labelled midpoint of a line or polygon mark"
        },
        "x": {
          "type": "number",
          "description": "Not read by this element or `@pie-lib/graphing-solution-set`."
        },
        "y": {
          "type": "number",
          "description": "Not read by this element or `@pie-lib/graphing-solution-set`."
        },
        "label": {
          "type": "string",
          "description": "Not read by this element or `@pie-lib/graphing-solution-set`."
        },
        "showLabel": {
          "type": "boolean",
          "description": "Not read by this element or `@pie-lib/graphing-solution-set`."
        }
      },
      "required": [
        "type"
      ]
    },
    "MarkType": {
      "type": "string",
      "enum": [
        "line",
        "polygon"
      ],
      "description": "Kind of mark: one of the item's lines, or a section of the graph picked as the solution set."
    },
    "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, optionally labelled."
    },
    "LineType": {
      "type": "string",
      "enum": [
        "Solid",
        "Dashed"
      ],
      "description": "How a line is drawn: solid for an inclusive inequality, dashed for a strict one."
    }
  }
}