Interfaces

interface Foo {
    is\_foo: Boolean
}
interface Goo {
    is\_goo: Boolean
}
type Bar implements Foo {
    is\_foo: Boolean
    is\_bar: Boolean
}
type Baz implements Foo, Goo {
    is\_foo: Boolean
    is\_goo: Boolean
    is\_baz: Boolean
}

Object implementing one or more Interfaces