The themes within a list can also be organized within subcategories defined by the user. ArcView already uses this directory as an alternate location for storing shared extensions. The local theme lists are grouped together as the local Theme Set, and the network lists are the network Theme Set. A theme list lets you organize your data or your parks data making it easier to find and display. Once a theme is incorporated into a Theme List, a user can easily locate the data without knowing the filename and location.
Descriptive names make it easier to remember what the data are.
You can incorporate definition queries, hotlinks, display scales, metadata, and help files, without having to set them each time you add the theme, they load automatically. New or periodic users who do not know what data are available can browse through the theme lists to find data of interest, quickly and easily.