[OASIS Issue Tracker] (MQTT-456) 3.2.2.3.7 Topic Alias Maximum - simplify text for 0 and absent cases

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Brian Raymor created MQTT-456:
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             Summary: 3.2.2.3.7 Topic Alias Maximum - simplify text for 0 and absent cases
                 Key: MQTT-456
                 URL: https://issues.oasis-open.org/browse/MQTT-456
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Bug
          Components: edits
    Affects Versions: 5, wd14
            Reporter: Brian Raymor
            Priority: Minor
             Fix For: 5, wd14



Lines 1572-1573 seems to suggest that there is different behavior for a value of 0 versus an absent value:

"A value of 0 indicates that the Server does not accept any Topic Aliases on this connection. If Topic Alias Maximum is absent, the Client MUST NOT send any Topic Aliases on to the Server ..."

Is this simply one case where an absent value defaults to zero? Not sure why there's a distinction between "does not accept" and "MUST NOT send" in this sentence since Line 1571 already states:

"Client MUST NOT send a Topic Alias in a PUBLISH packet to the Server greater than this value"



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