Libgda UI extension builds on top of Libgda and GTK+ to provide some graphical widgets, a control center (to manage DSN and list installed providers) and a browser program to analyze the contents of a database.
Libgda UI's components are:
the runtime files (shared library)
the GObject introspection files (to be used by the GObject introspection framework)
the tools, which require the runtime component
the development files (the includes to compile C programs)
the documentation and localization files are mixed with Libgda's ones
the tools have been described here as a separate component but it is highly recomended to bundle the tools with the runtime as they provide essential tools to the end user.