Function compose 

pub fn compose(
    view: &Reader<'_>,
    args: &DrawingArgs,
    date: &str,
    parts: &[PartsListLine],
) -> GeopResult<Sheet>

The part’s drawing as args describe it, dated date, with parts its bill of materials if args asks for one: its layout (see layout), with its annotations drawn on it. One that does not resolve — its view gone, an entity it names gone — is refused, naming it.