[OASIS Issue Tracker] Created: (MQTT-88) Clarify semantics of a SUBSCRIBE that contains multiple Topic Filters

Clarify semantics of a SUBSCRIBE that contains multiple Topic Filters
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                 Key: MQTT-88
                 URL: http://tools.oasis-open.org/issues/browse/MQTT-88
             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.1.1
            Reporter: Peter Niblett
             Fix For: 3.1.1


The Subscribe packet is allowed to contain more than one Topic Filter.  It is not clear whether 

1. This is just a convenience, allowing clients to combine multiple subscribe requests into a single Control Packet, thus saving network traffic, or
2. There is some additional semantic implied by the presence of two or more topic filters in a single packet (e.g. that they must all be granted if any of them is granted)

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