x1=xu1=z1 claims/asserts/states/witnesses/deduces/infers/[observes]/testifies/bears witness that x2=xu2=z2 using senses/means x3=z3 under conditions x4=z4 conforming to x5 (e.g. objective reality, epistimology, logical source, standard, subjective source).
The gismu xusra is broader than just claims. This definition is meant to take the more responsive or passive sense of the concept. See also: ri'arxu'a (declare).