content: {
    "$defs": {
      "Combo": {
        "description": "Combo represents the tax combination of a category code and rate key.",
        "properties": {
          "cat": {
            "$ref": "https://gobl.org/draft-0/cbc/code",
            "description": "Tax category code from those available inside a region.",
            "title": "Category"
          },
          "ext": {
            "$ref": "https://gobl.org/draft-0/tax/extensions",
            "description": "Local codes that apply for a given rate or percentage that need to be identified and validated.",
            "title": "Ext"
          },
          "percent": {
            "$ref": "https://gobl.org/draft-0/num/percentage",
            "calculated": true,
            "description": "Percent defines the percentage set manually or determined from the rate key (calculated if rate present).",
            "title": "Percent"
          },
          "rate": {
            "$ref": "https://gobl.org/draft-0/cbc/key",
            "description": "Rate within a category to apply.",
            "title": "Rate"
          },
          "surcharge": {
            "$ref": "https://gobl.org/draft-0/num/percentage",
            "calculated": true,
            "description": "Some countries require an additional surcharge (calculated if rate present).",
            "title": "Surcharge"
          }
        },
        "required": [
          "cat"
        ],
        "type": "object"
      },
      "Set": {
        "description": "Set defines a list of tax categories and their rates to be used alongside taxable items.",
        "items": {
          "$ref": "#/$defs/Combo"
        },
        "type": "array"
      }
    },
    "$id": "https://gobl.org/draft-0/tax/set",
    "$ref": "#/$defs/Set",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }