github.com/dgraph-io/dgraph@v1.2.8/graphql/schema/testdata/schemagen/input/interface-with-id-directive.graphql (about) 1 interface LibraryItem { 2 refID: String! @id 3 } 4 5 type Book implements LibraryItem { 6 title: String 7 author: String 8 } 9 10 type Library { 11 items: [LibraryItem] 12 }