content: {
    "$defs": {
      "Meta": {
        "description": "Meta defines a structure for data about the data being defined.",
        "patternProperties": {
          "^(?:[a-z]|[a-z0-9][a-z0-9-+]*[a-z0-9])$": {
            "type": "string"
          }
        },
        "type": "object"
      }
    },
    "$id": "https://gobl.org/draft-0/cbc/meta",
    "$ref": "#/$defs/Meta",
    "$schema": "https://json-schema.org/draft/2020-12/schema"
  }