Coordinate container class names VavailabilityType and AvailabilityType with those in Calendar Availability Internet Draft 05.
The containing interval is described in PIM by timeRange: AvailTimeRangeType which is fully bound. This timeRange is "busy-unavailable" for the specific interaction/parties of interest. (see p5) except for "except for any time periods corresponding to "AVAILABLE" sub-components." So the VavailabilityType in PIM CS01 corresponds to the VAVAILABILITY Component.
The AVAILABLE sub-components indicate periods of free times within the enclosing VAVAILABILITY...and may contain recurrence properties...