This value identifies which version (first octet) and release
(second octet) of the DLSw standard is supported by this
partner DLSw. This information is obtained from a DLSw
capabilities exchange message received from the partner DLSw.
A string of zero length is returned before a Capabilities
Exchange message is received, or if one is never received.
A conceptual row with a ciscoDlswTConnOperState of `connected' but
a zero length partner version indicates that the partner is
a non-standard DLSw partner.
If an implementation chooses to keep ciscoDlswTConnOperEntrys in
the `disconnected' state, this value should remain unchanged.