{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/1factory/refs/heads/main/json-schema/1factory-specification-schema.json",
  "title": "Specification",
  "description": "Specification that defines feature to be measured.",
  "type": "object",
  "properties": {
    "bln_no": {
      "type": "string",
      "nullable": false,
      "description": "Balloon number for feature.",
      "example": "1"
    },
    "sheet_zone": {
      "type": "string",
      "nullable": false,
      "description": "Sheet and zone of the specification",
      "example": "1 : B1"
    },
    "place": {
      "type": "integer",
      "minimum": 1,
      "description": "Place number - for features that have multiple places, feature specification is repeated for each place.",
      "example": 1
    },
    "characteristic": {
      "type": "string",
      "nullable": false,
      "description": "Characteristic being measured, or, in the case of a note, the text of the note.",
      "example": "True position"
    },
    "characteristic_type": {
      "type": "string",
      "nullable": false,
      "enum": [
        "Nom \u00b1 Tol",
        "GD&T",
        "Basic",
        "Min - Max",
        "Note",
        "Nom++Tol",
        "Nom -- Tol",
        "Reference"
      ],
      "description": "Type of characteristic being measured.",
      "example": "GD&T"
    },
    "dimension_type": {
      "type": "string",
      "nullable": false,
      "enum": [
        "STD",
        "MFG",
        "DVN"
      ],
      "description": "Dimension type for this specification - Standard, Manufacturing or Deviation.",
      "example": "STD"
    },
    "referenced_feature": {
      "type": "string",
      "nullable": true,
      "description": "Balloon number of specification that this feature references, for example a manufacturing dimension referencing the actual drawing dimension it corresponds to.",
      "example": "1"
    },
    "data_type": {
      "type": "string",
      "nullable": false,
      "enum": [
        "NUM",
        "P/F",
        "CALC"
      ],
      "description": "How the data for this specification is recorded - numerically, as a pass/fail, or calculated from other features.",
      "example": "NUM"
    },
    "nominal": {
      "type": "number",
      "nullable": true,
      "description": "Nominal value for this specification.",
      "example": 1.12
    },
    "lower_spec_limit": {
      "type": "number",
      "nullable": true,
      "description": "Lower specification limit for the feature.",
      "example": 1.11
    },
    "upper_spec_limit": {
      "type": "number",
      "nullable": true,
      "description": "Upper specification limit for the feature.",
      "example": 1.14
    },
    "unit": {
      "type": "string",
      "nullable": true,
      "description": "Unit of measure for this feature.",
      "example": "mm"
    },
    "descriptor_datum": {
      "type": "string",
      "nullable": true,
      "description": "Descriptor of feature. For GD&T, this is used to record the datum.",
      "example": "A"
    },
    "bonus_tolerance": {
      "type": "string",
      "nullable": true,
      "enum": [
        "MMC",
        "LMC"
      ],
      "description": "For GD&T features, defines the material condition for evaluating bonus tolerance, if applicable.",
      "example": "MMC"
    },
    "label": {
      "type": "string",
      "nullable": true,
      "description": "Optional label to add more information to the specification.",
      "example": "COUNTERSINK"
    },
    "inspection_method": {
      "type": "string",
      "nullable": true,
      "description": "How the feature should be inspected.",
      "example": "CMM"
    },
    "sampling_rule": {
      "type": "string",
      "nullable": true,
      "description": "How frequently should the feature be checked.",
      "example": "1 in 10"
    },
    "operation": {
      "type": "string",
      "nullable": true,
      "description": "Manufacturing operation for the feature.",
      "example": "OP10"
    },
    "is_key": {
      "type": "boolean",
      "nullable": false,
      "description": "Indicates if feature is key for quality.",
      "example": true
    }
  }
}