“…Free text [32, 37, 41, 43 45, 47, 48] Keywords [32, 37, 39, 43 45, 47, 48] Structural Analysis [32,37,38,40,41,45,47,48] URI comparison [32,37,46] re using and extending existing NLP techniques. Obviously, system traceability can be reached taking advantage of these existing approaches applying pattern matching techniques to link system artifacts.…”