{
  "$schema": "https://json-schema.org/draft-04/schema#",
  "type": "object",
  "description": "Common Canvas palette schema",
  "id": "https://api.dataplatform.ibm.com/schemas/common-canvas/palette/palette-v2-schema.json",
  "version": {
    "description": "Palette schema version",
    "enum": [
      "2.0"
    ]
  },
  "properties": {
    "categories": {
      "description": "Array of palette categories",
      "type": "array",
      "minItems": 0,
      "items": {
        "type": "object",
        "properties": {
          "category": {
            "description": "The palette category that the items belong within",
            "type": "string"
          },
          "description": {
            "description": "Category description",
            "type": "string"
          },
          "label": {
            "description": "Category label",
            "type": "string"
          },
          "image": {
            "description": "Encoded image or image reference for the category",
            "type": "string"
          },
          "nodetypes": {
            "description": "Array of nodes within the current category",
            "type": "array",
            "items": {
              "type": "object",
              "properties": {
                "label": {
                  "description": "Node label",
                  "type": "string"
                },
                "description": {
                  "description": "Node description",
                  "type": "string"
                },
                "type": {
                  "description": "Node classification type",
                  "enum": [
                    "binding",
                    "execution_node",
                    "super_node",
                    "model_node"
                  ]
                },
                "sub_type": {
                  "description": "Sub-flow editing type. Only used when 'type=super_node'. Default is 'canvas'",
                  "enum": [
                    "canvas",
                    "shaper"
                  ]
                },
                "operator_id_ref": {
                  "description": "Unique node type identifier",
                  "type": "string"
                },
                "image": {
                  "description": "Encoded image or image reference for the node",
                  "type": "string"
                },
                "subDiagramId": {
                  "description": "Optional sub diagram identifier.",
                  "type": "string"
                },
                "input_ports": {
                  "description": "Array of node input ports",
                  "type": "array",
                  "minItems": 0,
                  "items": {
                    "$ref": "#/definitions/port"
                  }
                },
                "output_ports": {
                  "description": "Array of node output ports",
                  "type": "array",
                  "minItems": 0,
                  "items": {
                    "$ref": "#/definitions/port"
                  }
                }
              },
              "required": [
                "label",
                "operator_id_ref",
                "image"
              ]
            }
          }
        },
        "required": [
          "category",
          "label"
        ]
      }
    }
  },
  "definitions": {
    "port": {
      "description": "Defines a node port for links",
      "type": "object",
      "properties": {
        "id": {
          "description": "Port identifier",
          "type": "string"
        },
        "label": {
          "description": "Port long label",
          "type": "string"
        },
        "cardinality": {
          "description": "Property to capture how many connections are allowed for this port, e.g., min: 1, max:1 implies you must supply 1 and only 1; min:0, max:1 implies it is optional and a max of one, min:0, max:-1 means it is optional and you can may have any number of connections. The default value is 1:1 for inputs and 1:-1 for outputs.",
          "type": "object",
          "properties": {
            "min": {
              "description": "Minimum data sets that are required for this port",
              "type": "integer",
              "default": 1
            },
            "max": {
              "description": "Maximum data sets that are allowed on this port. A negative value indicates unlimited. The default value is 1 for inputs and -1 for outputs.",
              "type": "integer"
            }
          },
          "additionalProperties": false
        }
      },
      "required": [
        "id"
      ]
    }
  }
}