Semantics is not part of Shannon's definition of information, since he was more concerned in transmitting information in a wire then to develop the full idea what is information etc.
Nonetheless, semantics is part of information. I mean, if information was one dimensional as Shannon proposed, then 'I have a black dog' would have less information then ''J'ai un chien noir''. But in reality, these two sentences have the same amount of information for the receiver.