Base class for implementing various dependency trees
Algorithm::Dependency is a framework for creating simple read-only
dependency hierarchies, where you have a set of items that rely on other
items in the set, and require actions on them as well.
Despite the most visible of these being software installation systems like
the CPAN installer, or Debian apt-get, they are useful in other situations.
This module intentionally uses implementation-neutral words, to avoid
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