It would be a great addition if we could add the origin from where a feature was extracted.

For example if you have GPX file with a track and a route, you will receive two features, but you don't know which feature was the track and which feature was the route.

Waypoints are obviously type: 'Point', so that would be straight forward. But at least for route and track it would be handy if one could determine which is which.

I could provide a PR for this adding a field to the properties like origin: wpt|rte|trk (or something along these lines).