you are on the right track. Please have a look at the "Annotate" operator. Here you can add annotations to all kinds of io-objects passed in RapidMiner. Though you cannot change the name of an example set in the result view, annotations can help you to identify your objects. You can define simple key/value-pairs which are also capable of handling the content of process macros. When you open an example set in the resultview just click on "Annotation" to inspect its additional information.