# Domains instead of modules

Jadpo has no modules. A domain owns everything in it, and it is the
boundary of what other code can see: a declaration is private to its
domain unless it is marked `public`.

A call into another domain names that domain, as in
`inventory.reserve_stock(...)`. Each file says where its other names come
from on `use` lines at its top. See
[Ownership and calls replace modules](ownership-and-calls-replace-modules.md)
and [Imports](imports.md).