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0.6

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git-svn-id: file:///home/ksmith/gitmigration/svn/xmpp/trunk@2936 4b5297f7-1745-476d-ba37-a9c6900126ab
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Peter Saint-Andre 2009-03-31 15:07:38 +00:00
parent f354689d73
commit ee50975867
1 changed files with 10 additions and 2 deletions
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xep-0237.xml
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@ -22,6 +22,12 @@
<supersededby/>
<shortname>NOT_YET_ASSIGNED</shortname>
&stpeter;
<revision>
<version>0.6</version>
<date>2009-03-31</date>
<initials>psa</initials>
<remark><p>Clarified definition of sequence number.</p></remark>
</revision>
<revision>
<version>0.5</version>
<date>2009-02-19</date>
@ -79,7 +85,9 @@
<section1 topic='Protocol' anchor='proto'>
<section2 topic='Data Format' anchor='format'>
<p>This document adds a new 'ver' attribute to the &QUERY; element qualified by the 'jabber:iq:roster' namespace. The value of the 'ver' attribute MUST be a non-negative integer representing a strictly increasing sequence number that is increased (but not necessarily incremented-by-one) with any change to the roster data.</p>
<p>This document adds a new 'ver' attribute to the &QUERY; element qualified by the 'jabber:iq:roster' namespace, defined as follows:</p>
<p class='def'><strong>Definition:</strong> The 'ver' attribute is a strictly increasing sequence number that is increased (but not necessarily incremented-by-one) with any modification to the roster data. The value of the attribute MUST be a non-negative 64-bit integer, MUST be changed only by the server, and MUST be treated by the client as opaque. The server MUST ensure that each change to the roster data will result in a different sequence number and that the sequence number associated with a given roster modification will be greater than the sequence number associated with any previous roster modification. (Note: This rule effectively disallows the use of the system clock as a sequence number, since if the system time changes, e.g. because of an adjustment based on an NTP &rfc0958; update, the next generated value might be less than the previous one.)</p>
<p>For purposes of this specification, a "roster modification" is any change to the roster data that would result in a roster push to a connected client. Therefore internal states related to roster processing within the server that do not result in a roster push do not necessitate a change to the sequence number.</p>
</section2>
<section2 topic='Client Request' anchor='request'>
<p>If a client supports roster versioning, it SHOULD include the 'ver' element in its request for the roster, where the 'ver' attribute is set to the sequence number associated with its last cache of the roster.</p>
@ -184,7 +192,7 @@
</section1>
<section1 topic='Acknowledgements' anchor='ack'>
<p>Thanks to Dave Cridland, Richard Dobson, Fabio Forno, Alexander Gnauck, Juha Hartikainen, Joe Hildebrand, Justin Karneges, Curtis King, Pedro Melo, and Jiří Zárevúcký for their comments.</p>
<p>Thanks to Dave Cridland, Richard Dobson, Fabio Forno, Alexander Gnauck, Juha Hartikainen, Joe Hildebrand, Justin Karneges, Curtis King, Pedro Melo, and Jiří Zárevúcký for their comments. The definition of a sequence number borrows concepts and text from &rfc4551;</p>
</section1>
</xep>