code: private static ICalDataType toDataType(String localName) {
  		return "unknown".equals(localName) ? null : ICalDataType.get(localName);
  	}
docs: Converts an XML local name to the appropriate {@link ICalDataType}
  object.
  @param localName the local name (e.g. "text")
  @return the data type or null for "unknown"