This is the framework's top-level namespace or "package". It contains some fundamental classes, while the rest of the class hierarchy is available in the corresponding sub packages. Please see the descriptions below. The little + preceding a name offers more descriptive text when you click on it. All packages are structured in the same way. Use either the hyperlinks in the listing, or the tree structure to navigate to the corresponding packages and their documentation. You can also use the Search button to find certain class and method names, and the Legend button for information about the symbols used throughout this reference. Use the toolbar buttons to to the right to tailor the amount of information that is displayed with each class, e.g. you can enable display of inherited or protected class members.