code: public boolean isInstanceOfTag(String tag) {
        return !StringUtils.isNullOrBlank(tag) && isInstanceOfTag(Cast.<Tag>as(getType().getTagAttribute()
                                                                                        .getValueType()
                                                                                        .decode(tag)));
     }
docs: Determines if this annotation's tag is an instance of the given tag (String form). The string form the given tag
  will be decoded into the correct tag type.
  
  @param tag the string form of the tag to check
  @return True if this annotation's tag is an instance of the given tag.