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.