[OASIS Issue Tracker] Commented: (MQTT-76) Should "+" be allowed at the beginning of the topic filter in a subscription?

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    [ http://tools.oasis-open.org/issues/browse/MQTT-76?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=34673#action_34673 ] 

Richard Coppen commented on MQTT-76:
------------------------------------

Take to TC call 19.09.2013

> Should "+" be allowed at the beginning of the topic filter in a subscription?
> -----------------------------------------------------------------------------
>
>                 Key: MQTT-76
>                 URL: http://tools.oasis-open.org/issues/browse/MQTT-76
>             Project: OASIS Message Queuing Telemetry Transport (MQTT) TC
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.1.1
>            Reporter: Andrew Banks
>             Fix For: 3.1.1
>
>
> Draft09 says 
> 4.5.1.3 Single level wildcard
> The plus sign ('+' 0x2B) is a wildcard character that matches only one topic level. 
> The single-level wildcard can be used at any level in the topic filter. It can be used in conjunction with the multilevel wildcard. 
> It MUST be the only character between two topic level separators, or the last level, or on its own. 
> The input Specification says:
> The single-level wildcard can be used at any level in the topic tree, and in
> conjunction with the multilevel wildcard. It must be used next to the topic level
> separator, except when it is specified on its own. Therefore, + and finance/+ are
> both valid, but finance+ is not valid. The single-level wildcard can be used at the
> end of the topic tree or within the topic tree. For example, finance/+ and
> finance/+/ibm are both valid.
> Apparently the intent of the input specification was to mean "either end of the topic tree" ie at the beginning or the end, 
> hence +/finance would be a valid topic filter.

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