equipment-type = [name: tstr, manufacturer: tstr]
equipment-type-2 = [tstr .default "hello", tstr]
equipment-type-3 = [? tstr, tstr]
equipment-tolerances = [+ [float, float]]

person = (
    name: tstr,
    age: uint,
)
unlimited-people = [* person]
one-or-two-people = [1*2 person]
at-most-two-people = [*2 person]
at-least-two-people = [2* person]
one-person = [person]
two-person = [person, person]
optional-person = [? person]
person-with-equipment = [* person, *equipment-type]
person-with-attr-names = [* named: {person}]
person-with-attr-names-1 = [* named: {person}, * equip: equipment-type]
person-with-attr-names-2 = [* named: {person}, * equipment-type]
person-with-attr-names-3 = [* named: {person}, ? equipment-type]