{
  "$id": "atom-feed-schema.json",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Atom 1.0 Feed",
  "description": "Schema describing an atom:feed element per IETF RFC 4287 (Atom Syndication Format). Atom uses the namespace http://www.w3.org/2005/Atom and the application/atom+xml media type.",
  "type": "object",
  "required": [
    "id",
    "title",
    "updated"
  ],
  "properties": {
    "id": {
      "type": "string",
      "format": "iri",
      "description": "Permanent, universally unique identifier for the feed (IRI). Required, exactly one."
    },
    "title": {
      "type": "object",
      "description": "Human-readable title for the feed. Required, exactly one.",
      "required": [
        "value"
      ],
      "properties": {
        "value": {
          "type": "string"
        },
        "type": {
          "type": "string",
          "enum": [
            "text",
            "html",
            "xhtml"
          ],
          "default": "text"
        }
      }
    },
    "updated": {
      "type": "string",
      "format": "date-time",
      "description": "Most recent instant when the feed was meaningfully modified, per RFC 3339. Required, exactly one."
    },
    "author": {
      "type": "array",
      "description": "Author(s) of the feed. One or more required unless every entry contains its own author element.",
      "items": {
        "type": "object",
        "required": [
          "name"
        ],
        "properties": {
          "name": {
            "type": "string"
          },
          "email": {
            "type": "string",
            "format": "email"
          },
          "uri": {
            "type": "string",
            "format": "iri"
          }
        }
      }
    },
    "link": {
      "type": "array",
      "description": "References from the feed to web resources. Common rel values: self, alternate, related, enclosure, via.",
      "items": {
        "type": "object",
        "required": [
          "href"
        ],
        "properties": {
          "href": {
            "type": "string",
            "format": "iri"
          },
          "rel": {
            "type": "string",
            "default": "alternate"
          },
          "type": {
            "type": "string",
            "description": "Media type of the linked resource."
          },
          "hreflang": {
            "type": "string"
          },
          "title": {
            "type": "string"
          },
          "length": {
            "type": "integer"
          }
        }
      }
    },
    "category": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "term"
        ],
        "properties": {
          "term": {
            "type": "string"
          },
          "scheme": {
            "type": "string",
            "format": "iri"
          },
          "label": {
            "type": "string"
          }
        }
      }
    },
    "contributor": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "name"
        ],
        "properties": {
          "name": {
            "type": "string"
          },
          "email": {
            "type": "string",
            "format": "email"
          },
          "uri": {
            "type": "string",
            "format": "iri"
          }
        }
      }
    },
    "generator": {
      "type": "object",
      "properties": {
        "value": {
          "type": "string"
        },
        "uri": {
          "type": "string",
          "format": "iri"
        },
        "version": {
          "type": "string"
        }
      }
    },
    "icon": {
      "type": "string",
      "format": "iri",
      "description": "IRI of a small image (favicon-sized) providing iconic visual identification."
    },
    "logo": {
      "type": "string",
      "format": "iri",
      "description": "IRI of a larger image providing visual identification (recommended 2:1 aspect ratio)."
    },
    "rights": {
      "type": "string",
      "description": "Information about rights held in and over the feed."
    },
    "subtitle": {
      "type": "string",
      "description": "Human-readable description or subtitle for the feed."
    },
    "entry": {
      "type": "array",
      "description": "Entries belonging to the feed.",
      "items": {
        "$ref": "atom-entry-schema.json"
      }
    }
  },
  "additionalProperties": true
}