Iglu root metaschema suggestion.json

{
  "$schema": "http://iglucentral.com/schemas/com.snowplowanalytics.self-desc/schema/jsonschema/1-0-0#",
  "description": "Meta-schema for self-describing JSON schema",
  "self": {
    "vendor": "com.snowplowanalytics.self-desc",
    "name": "schema",
    "format": "jsonschema",
    "version": "2-0-0"
  },
  "allOf": [
    {
      "properties": {
        "self": {
          "type": "object",
          "properties": {
            "vendor": {
              "type": "string",
              "pattern": "^[a-zA-Z0-9-_.]+$"
            },
            "name": {
              "type": "string",
              "pattern": "^[a-zA-Z0-9-_]+$"
            },
            "format": {
              "type": "string",
              "pattern": "^[a-zA-Z0-9-_]+$"
            },
            "version": {
              "type": "string",
              "pattern": "^[0-9]+-[0-9]+-[0-9]+$"
            }
          },
          "required": [
            "vendor",
            "name",
            "format",
            "version"
          ],
          "additionalProperties": false
        }
      },
      "metadata": {
        "type": "object"
      },
      "required": [
        "self"
      ]
    },
    {
      "$ref": "http://json-schema.org/draft-04/schema#"
    }
  ]
}