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The sid field is an optional sequence identifier (monotonically increasing integers) which, if provided by the client, should be duplicated in the server's response to that event. Note that, in general, serverserver-initiated events do not include a sid field. NOTE: to date we have found no real
| Warning |
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| To date, no particular use for the SID |
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| field has been found. It is thus deprecated, and may be removed in a future release. |
The payload field is an arbitrary JSON object, the structure of which is implied by the event type. Many payloads include an id field at the top level, which holds the unique ID of the item being described by the event.
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