Get wkt of an OSM feature

Given any OSM feature (e.g. a relation https://www.openstreetmap.org/relation/2433965)), how do I get its current wkt?

(note: someone may have edited it 5 mins ago, and I would like to its current wkt…)

One way is to use this api call:
https://www.openstreetmap.org/api/0.6/relation/2433965/full

Thanks! That api is helpful! It gives a xml, any quick idea on how to convert xml into wkt?