DSS2 — Section 9.1.7: Convey Region Designator Sets Switch: when conveyed

According to the fourth paragraph of section 9.1.7, whenever the Convey Region Designator Sets Switch is enabled, "the optional Set of Sent Region Designators argument shall be provided (as appropriate) with all Reflect Attribute Values † and Receive Interaction † service invocations at all joined federates".

The meaning of "as appropriate" should be clarified. The following text is recommended as consistent with the rest of the standard:

The Set of Sent Region Designators argument shall be provided in a Reflect Attribute Values service invocation or in a Receive Interaction service invocation if and only if:
· the Convey Region Designator Sets Switch is enabled, and
· the reflected instance attribute(s) or the received interaction has available dimensions.
This means that if the above conditions are true, all federates, not just those federates that are using DDM or that are subscribed to the specified attributes or interaction class with regions, will receive the reflect or interaction with a set of sent region designators argument.

Add the suggested clarifying text.