*.components.rs

Every pub struct is a component. A struct without pub is a shape the components use. Its fields are always pub.

// types/body/body.components.rs
struct Vec3 {
    pub x: f64,
    pub y: f64,
    pub z: f64,
}

/// Where the body is, and when that was sensed.
pub struct Pose {
    pub position: Vec3,
    pub rotation: [f64; 4],
    pub sensed: f64,
}

/// The last depth look, as points.
pub struct Cloud {
    pub points: Array<f32>,
    pub sensed: f64,
}

Only structs with named fields, and no attributes but doc comments. The file is read, never compiled — systems use the generated types at crate::schema::….