1. Data Access Worldwide May 16 – 18, 2007 Copyright 2007, Data Access Worldwide May 16 – 18, 2007 Copyright 2007, Data Access Worldwide Build a Rich Development Toolkit, Fast & Easy Stephen W. Meeley

2. May 16 – 18, 2007 Copyright 2007, Data Access Worldwide What is a Library A Library is a group of classes (files) that are defined in a way that they can be used by multiple workspaces. A Workspace may include any number of libraries. Libraries are themselves just a workspace. Libraries are created and maintained within that library’s workspace. Although libraries are complete workspaces, only their classes and templates are used within other workspaces.

3. May 16 – 18, 2007 What is a Library A library has its own AppSrc\config folder and will contain all of the required configuration information such as a class list and object preference files. A library may contain other libraries. When a library defines classes it will define those classes based on the super-classes that are already defined. Those can be classes defined in the library, classes defined in a library being used by the library, or classes defined in the System Class Library. Copyright 2007, Data Access Worldwide

4. May 16 – 18, 2007 System Class Library The system class library consists of the packages and classes installed as part of a Standard Visual DataFlex installation. The files in the System Class Library are read-only and should never be changed by the developer. All workspaces and all libraries always have access to the System Class library. They do not need to be explicitly added as a library. Copyright 2007, Data Access Worldwide