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Subject: [OASIS Issue Tracker] (MQTT-204) Make $ topic separation normative
[ https://tools.oasis-open.org/issues/browse/MQTT-204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=36872#comment-36872 ] Peter Niblett commented on MQTT-204: ------------------------------------ We discussed this extensively in MQTT-16. My understanding is the same as Al's, namely we decided that a topic name with a leading $ is never matched by a topic filter with a leading + or #, regardless of whether the server has defined any $xxx topics or not. I think the reason it doesn't have a MUST in it was simply to make it look better as an English statement. However we need to clarify this as the fact that Section 4.2.7 starts off with a MAY and this statement is included in an apparently subordinate 4.2.7.1 makes it look as if it might only apply in cases where the server has defined $xxx topics. Incidentally this shows one of the problems of "hanging paragraphs" (see mqtt-142). If the bit saying the server MAY define $xxx was in 4.2.7.1 and the bit about subscription matching was in 4.2.7.2 then it would be more obvious that they are independent > Make $ topic separation normative > --------------------------------- > > Key: MQTT-204 > URL: https://tools.oasis-open.org/issues/browse/MQTT-204 > Project: OASIS Message Queuing Telemetry Transport (MQTT) TC > Issue Type: Improvement > Components: core > Reporter: Allan Stockdill-Mander > > Section 4.7.2.1 of wd-20 states; > A Topic Filter that starts with a wildcard character (# or +) does not match Topic Names that begin with a $ character > This appears to be a normative statement regarding server behaviour without any accompanying normative language. > While server implementations may choose whether or not to implement predefined $topics I thought we explicitly did want separate all topics starting with $ from the rest of the topic space. -- This message was sent by Atlassian JIRA (v6.1.1#6155)
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