9.2 Categories of documents (X, Y, P, A, D, etc.)
9.2.2 Documents defining the state of the art and not prejudicing novelty or inventive step
Where a document cited in the search report represents state of the art that does not prejudice the novelty or inventive step of the claimed invention, it is labelled with the letter "A" (see, however, B‑III, 1.1).