That analogy doesn't make sense, as I understand the feature. They're not patenting "basically" NSLinguisticTagger. They're patenting the use of linguistic anal

That analogy doesn't make sense, as I understand the feature. They're not patenting "basically" NSLinguisticTagger. They're patenting the use of linguistic analysis to provide visual focus in a text editor. Again, yes, this is obvious in retrospect, but AFAIK, no one else was using linguistic analysis in this way before.