schema.json

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "additionalProperties": false,
  "required": [
    "version",
    "user_comment",
    "title",
    "home_page_url",
    "feed_url",
    "author",
    "items"
  ],
  "properties": {
    "version": {
      "type": "string",
      "format": "uri"
    },
    "user_comment": {
      "type": "string",
      "contentMediaType": "text/plain"
    },
    "title": {
      "type": "string",
      "contentMediaType": "text/plain"
    },
    "home_page_url": {
      "type": "string",
      "format": "uri"
    },
    "feed_url": {
      "type": "string",
      "format": "uri"
    },
    "author": {
      "type": "object",
      "additionalProperties": false,
      "required": [ "name", "url", "avatar" ],
      "properties": {
        "name": { "type": "string" },
        "url": {
          "type": "string",
          "format": "uri"
        },
        "avatar": {
          "type": "string",
          "format": "uri"
        }
      }
    },
    "items": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": [ "id", "url", "content_text", "date_published" ],
        "properties": {
          "id": { "type": "string" },
          "url": {
            "type": "string",
            "format": "uri"
          },
          "content_text": {
            "type": "string",
            "contentMediaType": "text/plain"
          },
          "date_published": {
            "type": "string",
            "format": "date-time"
          }
        }
      }
    }
  }
}