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why need to check if inline doc is already defined?


i noticed that in many addon packages,

they define the inline doc by first checking whether it is already defined,
e.g. at ... Mathematica/7.0/AddOns/Packages/FourierSeries/
FourierSeries.m

like this:

If[Not@ValueQ[SomeF::usage],SomeF::usage = "..."

why does it need to check if it is already defined?

  Xah =E2=88=91 http://xahlee.org/


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