R. 43 EPC concerns the form and content of claims. Apart from the requirement that the claims define the matter for which protection is sought in terms of the technical features of the invention it concerns the following issues which are the subject of this sub-chapter: the two-part form of claims, the exceptions to the general rule that the application may contain no more than one independent claim in the same category, the reasonable number of claims and the provision that claims should normally not rely on references to the description and drawings in specifying the technical features of the invention. R. 43 EPC has also been discussed in the context of clarity of claims (see in this chapter II.A.3.7.).