 However, from the point of view of attribution, the expression (oratio) can also be considered the subject matter of grammar, as everything that grammar considers is in one way or another related to it (QPm; QPm-1980: 104). More specifically, from the point of view of predication, the expression is discussed in the so-called Priscian Minor (books XVII–XVIII of Priscian’s Institutiones), which is exclusively concerned with the principles of grammatical expressions and with the demonstration of their features (QPm; QPm-1980: 107).