Forms

aql

artist {
    name,
    [album]s,
    [city]
}
city {
    name as city_name
}

html

<form model="artist" method="post">
    <input name="name" />
    <input name="album[0][name]" />
    <input name="album[0][label][name]" />
    <input name="city_name" />
</form>