The most frequent cases of violation of the connectivity principle are not attached adjectival modifiers, determiners, adverbs, and coordinations; sometimes, the verb is not connected with its argument(s).
prior to starting the training procedure, the semantic annotation must be completed: non-connected adjectival modifiers must be annotated as predicates with their syntactic heads as arguments, determiners must be "translated" into quantifiers, detached verbal arguments must be connected with their head, etc.