Function own_solids_at 

pub fn own_solids_at<'a>(
    reader: &Reader<'a>,
    instance: &str,
    pose: Option<Pose>,
) -> GeopResult<Vec<PlacedSolid<'a>>>

The solids of the part reader reads itself — not of the parts placed in it, and none only drawn (see crate::SolidNote::drawn_only) — the oldest first, each named behind prefix and placed at pose: as the part placed there at the path instance has them.