code: public static Tag getTag(int identifier) {
      Tag t = null;
      try {
        if (instance == null)
          getTiffTags();
      } catch (ReadTagsIOException e) {
        /*Nothing to be shown*/
      }
      if (tagMap.containsKey(identifier))
        t = tagMap.get(identifier);
      return t;
    }
docs: Gets tag information.
  
  @param identifier Tag id
  @return the tag or null if the identifier does not exist