public virtual void EnumerateTagsInRange(NSRange range, string scheme, NSLinguisticTaggerOptions options, Action <string, NSRange, NSRange, UnsafeMutablePointer <ObjCBool> > usingBlock)
 {
 }
 public virtual AnyObject[] TagsInRange(NSRange range, string scheme, NSLinguisticTaggerOptions options, AutoreleasingUnsafeMutablePointer <NSArray> tokenRanges)
 {
     return(default(AnyObject[]));
 }