Frameworks - Installing
A framework is a hierarchical directory that encapsulates shared resources, such as a dynamic shared library, nib files, image files, localized strings, header files, and reference documentation in a single package. Multiple applications can use all of these resources simultaneously. The system loads them into memory as needed and shares the one copy of the resource among all applications whenever possible.
(taken from Apple's Framework Programming Guide.)
If a framework comes with an installer, use that. If the framework comes as a .dmg file, install it. If that contains .pkg pieces, single click the .pkg file, and use Open With... and then select Installer.
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