When analysing the application, the examiner should concentrate on trying to understand what contribution the invention as defined in the claims adds to the known art. This should normally be sufficiently clear from the application as filed. If it is not, an objection should be raised in the search opinion (see C-II, 4.5); but the examiner should not raise an objection of this kind unless he is convinced it is necessary, since to do so might result in the applicant introducing additional subject-matter and thus offending against Art. 123(2) (see C-VI, 5.3 to C-VI, 5.3.11).