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Inside Macintosh: Mac OS Runtime Architectures /: Chapter 3 - Programming for the CFM-Based Runtime Architecture / Import Library Techniques

Put New Symbols in New Logical Libraries
A developer can give logical names to different portions of a library and then have multiple 'cfrg'0 entries to point to a single implementation. For example, consider the breakdown of mooLib in Figure 3-4.
Figure 3-4 Multiple logical names for a single library

The updated portion of each new version has its own logical name. For example, if your program called a routine introduced between versions 1.1 and 2.0 of mooLib, it would look for the symbol in the library ;mooLib_1.1-2.0. The advantage here is that the name of the library explicitly indicates the version of mooLib that introduced any particular export. A disadvantage is that since a new library name is added with each revision, the number of names may become unwieldy over time.

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