code: public String process(String document, ResultFormatter resultFormatter)
  			throws DocumentCreationTimeMissingException {
  		return process(document, null, resultFormatter);
  	}
docs: Processes document with HeidelTime
  
  @param document
  @return Annotated document
  @throws DocumentCreationTimeMissingException
  If document creation time is missing when processing a
  document of type {@link DocumentType#NEWS}. Use
  {@link #process(String, Date)} instead to provide document
  creation time!