#[derive(Debug, Deserialize)]
pub struct Length {
pub feet: Option<f64>,
pub meters: Option<f64>
}
#[derive(Debug, Deserialize)]
pub struct Volume {
pub cubic_feet: u16,
pub cubic_meters: u16
}
#[derive(Debug, Deserialize)]
pub struct Weight {
pub kg: f64,
pub lb: f64
}
#[derive(Debug, Deserialize)]
pub struct Force {
#[serde(rename="kN")]
pub kn: f64,
pub lbf: f64
}