A Framework is a collection of resources and a library that provides
common code that can be linked into a Tool or Application. In many
respects it is similar to a Bundle, and it accepts all the standard
project options listed previously.
— Frameworks: FRAMEWORK_NAME
FRAMEWORK_NAME refers to the name of the framework project.
— Frameworks: RESOURCE_FILES
xxx_RESOURCE_FILES is the files to be included as resources in the framework, such as images, property lists, etc.