Package Structure
A Nep package can be divided into an "Inner-package" and an "Outer-package". A valid Nep package refers to a valid Outer-package; a valid Outer-package should enclose a valid Inner-package.
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A Nep package can be divided into an "Inner-package" and an "Outer-package". A valid Nep package refers to a valid Outer-package; a valid Outer-package should enclose a valid Inner-package.