This are extensions!! Jon 25 Fred The other Fred. Hello Jon No Harry? Hey Calahan... Hello Fred Hello Fred#2 Hello Jon, 25 years Hello Henry, 27 years Salut Amed, 24 ans Jon: /25/25 Henry: /27/ Amed: 24/24/24 Jon: /25/25 Henry: /27/ Amed: 24/24/24 (1) person: { "name": "Jon", "age": 25 } (2) name: Jon (2) age: 25 (1) person.name: Fred (1) person.name=Fred: The other Fred. (1) persons: [ { "name": "Jon", "age": 25, "lang": "en" }, { "name": "Henry", "age": 27, "lang": "en" }, { "name": "Amed", "age": 24, "lang": "fr" } ] (1) fellows: { "Jon": { "age": 25, "lang": "en" }, "Henry": { "age": 27, "lang": "en" }, "Amed": { "age": 24, "lang": "fr" } } (2) Jon: { "age": 25, "lang": "en" } (3) age: 25 (3) lang: en (2) Henry: { "age": 27, "lang": "en" } (3) age: 27 (3) lang: en (2) Amed: { "age": 24, "lang": "fr" } (3) age: 24 (3) lang: fr