enum to pass the list of cities from XLS to XML

I am reading xls and populating xml by manipulating existing framework code. In existing framework code each sheet of the xls represent a city. They are looping based on the city count and setting the city name using setter method to a XML XSD element.  For all city names they are using enum to store all the values.

In my approach I am using apachi poi and checking number of sheets to loop all the cities. I did not create enum as well. How do I create enum to set the city name as the enum to pass to existing xml xsd framework to generate XML.

Any ideas, suggestions, sample code, links, source code highly appreciated. Thanks in advance