Need to be able to say what you need, and the computer / compiler works out the functions needed to be used to achieve that from what you already have.  Perhaps there can be a `cost' associated with each function, which the compiler uses to choose appropriate networks.

E.g.
  need: imap spool directory of user
  have: user name, partition name

  Vs

  need: imap spool directory of user
  have: user name

The latter must do a (costly) database lookup to find the partition name.