One way to give the reader the idea that it is shared data that never changes is to put a comment in that says: 
# This is shared data! Do not change it!

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Perl's contracts are usually maintained by agreement rather than by enforcement. Of course, you could encapsulate it (as another poster has suggested).
Caution: Contents may have been coded under pressure.

In reply to Re: Representing Complex but Static Data in Perl by Roy Johnson
in thread Representing Complex but Static Data in Perl by cyocum

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