1extend schema 2 @link(url: "https://specs.apollo.dev/federation/v2.3", 3 import: ["@key"]) 4 5interface Hello @key(fields: "id"){ 6 id: String! 7 title: String! 8} 9 10type World implements Hello @key(fields: "id") { 11 id: String! 12 title: String! 13}