1. I know what is "a domain of that category",
    but what does this mean:  "a package of that category" ?

A category (or in other words, an interface) is (basically) just a list of exports of the form

  foo: A -> B

A domain or package is an implementation of this interface.
The difference between package and domain is: in the exports of a domain appears % in the exports of a package it doesn't. But, I'm sure you know this already. So where exactly is your problem with the above?

Ralf

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