SDRP — Inconsistent use of the term "Facility or Facilities"

Problem: In chapter 4, Facility is defined to be, "An environment providing
a realization of certain functionality through set of well defined
interfaces." Subsequently, in chapter 9, the SWRADIO PIM components (5
Facilities) are defined not referring to "environments", but refer to "set
of interfaces", "set of services", and for the last three, functional
definitions. These "facility" definitions are confusing, and need to be
worded to reflect consistent ideas.

Proposed Solution: The ultimate solution would be to refactor the
specification to reflect the standard definitions provided in the OMAG
(http://www.omg.org/docs/ab/97-05-05.pdf <http://www.omg.org/oma/>) - upon
which the MDA (<http://www.omg.org/docs/omg/03-06-01.pdf> and its current
terminologies) was guided. Shy of that, redo the definitions of "facility"
in chapter 4, and change the facilities as defined in chapter 9 to
consistently reflect the following definitions.

In summary there are four classifications of object interfaces:

• Object Services are interfaces for general services that are likely
  to be used in any program based on distributed objects.
• Common Facilities are interfaces for horizontal end-user-oriented
  facilities applicable to most application domains.
• Domain Interfaces are application domain-specific interfaces.
• Application Interfaces are non-standardized application-specific
  interfaces.

Rationale: This change will clarify the intent of a facility in the SWRadio
specification, and make it consistent with standard OMG-speak.

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