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What does the `X` suffix mean in namespaces?

There are Perl module names like Moose and MooseX or DBI and DBIx or Catalyst and CatalystX or Mojo and MojoX or PPI and PP开发者_如何学CIx, etc.

What does the X suffix mean there?


eXtension, pretty much. It is just a convention to add features to a code base without stomping on the actual namespace or trespassing. DBIx means it's related to but not a part of DBI, for example.

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