Returns the child collection object of the value. Use this method to display and maintain the version hierarchy.
The IPIVersion interface may be supported by any PI-SDK object. The results are returned as an IUnknown object to support this abstraction. Currently, only PIModule supports this interface. The result in this case is a PIModules collection for the specific version of the object.
This collection is different than the one returned by setting the QueryDate of a PIModule and asking for its PIModules collection. That one depends on the QueryDate set for the PIModule.