code: public static final void setReader(String format, TreeReader reader) {
  		String key = format.toLowerCase();
  		readers.put(key, reader);
  		if (JSON.equals(key)) {
  			cachedJsonReader = reader;
  		}
  	}
docs: Binds the given TreeReader instance to the specified data format.
  
  @param format
  name of the format (eg. "json", "xml", "csv", etc.)
  @param reader
  TreeReader instance for parsing the specified format