[This is preliminary documentation and is subject to change.]
Gets or sets the the versions of SIF supported by the agent when the class
framework sends a SIF_Register message to the zone.
A comma-delimited list of SIF version or wildcard tags.
When connecting to a SIF 1.1 or later zone integration server, the
class framework will include a SIF_Version element for the version
of SIF used to initialize the Adk, followed by one additional
SIF_Version element for each version specified by this value.
If this property is not defined, it will return null