code: public EndpointBuilder<T> export(Class<?>... additional) {
  		this.additionalInterfaces.addAll(Arrays.asList(additional));
  		return this;
  	}
docs: Adds classes to a list of additional interfaces implemented by an XML-RPC
  server. Interface methods should be annotated by {@link XRMethod}.
  
  @param additional
  interfaces implemented by XML-RPC server
  @return this for method chaining