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Terminology
It is important to understand the terminology used with this feature. Library - A collection of library blocks. A library must be explicitly created using New Library from the File menu. Library block - A block in a library. Reference block - A copy of a library block. Link - The connection between the reference block and its library block that allows Simulink to update the reference block when the library block changes. Copy - The operation that creates a reference block from either a library block or another reference block. This figure illustrates this terminology.