| Central
premise III |
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| • | The
semantics of the module must remain |
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| unchanged
when implementations are |
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| replaced |
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| – | Specifically,
the client should not care how the |
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| interface
is implemented by the module |
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| • | But
what captures the semantics of the |
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| module? |
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| – | The
signature of the interface?
Performance? |
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| What
else? |
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