_:nf6b9f74bc02243f8b04620574d1d97f6xb1
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/WebPageElement>
<https://koenig-assets.raywenderlich.com/books/kotlin-apprentice/v2.0/chapters/17-interfaces>