content: {
    "$defs": {
      "Header": {
        "description": "Header defines the metadata of the body.",
        "properties": {
          "dig": {
            "$ref": "https://gobl.org/draft-0/dsig/digest",
            "description": "Digest of the canonical JSON body.",
            "title": "Digest"
          },
          "draft": {
            "description": "When true, implies that this document should not be considered final. Digital signatures are optional.",
            "title": "Draft",
            "type": "boolean"
          },
          "meta": {
            "$ref": "https://gobl.org/draft-0/cbc/meta",
            "description": "Additional semi-structured information about this envelope.",
            "title": "Meta"
          },
          "notes": {
            "description": "Any information that may be relevant to other humans about this envelope",
            "title": "Notes",
            "type": "string"
          },
          "stamps": {
            "description": "Seals of approval from other organisations that can only be added to\nnon-draft envelopes.",
            "items": {
              "$ref": "https://gobl.org/draft-0/head/stamp"
            },
            "title": "Stamps",
            "type": "array"
          },
          "tags": {
            "description": "Set of labels that describe but have no influence on the data.",
            "items": {
              "type": "string"
            },
            "title": "Tags",
            "type": "array"
          },
          "uuid": {
            "description": "Unique UUIDv1 identifier for the envelope.",
            "format": "uuid",
            "title": "UUID",
            "type": "string"
          }
        },
        "required": [
          "uuid",
          "dig"
        ],
        "type": "object"
      }
    },
    "$id": "https://gobl.org/draft-0/head/header",
    "$ref": "#/$defs/Header",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }