The APIs documented here are those that are considered frozen and that we expect
not to change within minor releases of Pegasus. It is an objective of Pegasus
to keep these APIs frozen as long as Pegasus remains at the version 2.x revision
level so that providers written for any 2.x Pegasus will run in environments that
use the same or higher level revisions.
Note that Pegasus does extend and add new APIs to the publically available API set
most releases as new functionality is defined. Typically these are marked experimental
for the first release so that developers can be made aware that they may change. Once
they have been tested and used, the experimental qualifications will be removed and they
become part of the Pegasus public API set.
REVIEWERS: more on versions.