The attached example in config.zip has a library (called "Config_lib.mdl") that contains a Configurable Subsystem that allows switching between a subsystem implementation and a subsystem wrapped around a Model Reference block (which in turn uses the Subsystem block as its algorithm).
The other files contained in the ZIP-file are:
mtop.mdl - the top level model
Mconfig1.mdl - a referenced model
The Configurable Subsystem in the "Config_lib" library is masked to eliminate the need for two masks. The single source for the algorithm is the Subsystem in the library. The Configurable Subsystem allows for easy switching between a Model Reference implementation and a Subsystem implementation.
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