type address = { address: String, country: Symbol? }
type email = { email: String }

class AddressSchema < StrongJSON
  def address: -> StrongJSON::Type::Object[address]
  def email: -> StrongJSON::Type::Object[email]
  def contact: -> StrongJSON::Type::Object[email | address]
  def person: -> StrongJSON::Type::Object[{ name: String, contacts: Array[email | address] }]
end

Schema: AddressSchema