This section explains the various operations you can perform on rule sets.
A rule set is a feature that gathers rules and
checks. There can be several rule sets in a rule base. The purpose
of a rule set is to gather the relations which have something in
common, process the same kind of features or are meaningful only
when used together. Rule sets are either automatically created upon
creation of rules and checks, or interactively created. Rule
sets can be nested within a rule base.