وَيَنْقَسِمُ إِلَى حَقِيقِيٍّ وَإِضَافِيٍّ
It is divided into real and relative restriction.
Real qasr expresses exclusivity in the actual state of affairs, not merely compared with a selected alternative.
Relative qasr is established in relation to a particular competing possibility. It therefore does not automatically deny every other attribute or every other person. The wording and the conversational context together determine the intended scope.