Re: [emergency-cap] FW: CAP Cancel question

[rexbroo <rexb@starbourne.com>]

From the Issues List https://issues.oasis-open.org/browse/EMERGENCY-31

There are multiple different ways to Cancel a CAP message, each with subtle meanings.

msgType Cancel is more akin to Revoke. Consider renaming, and adding a requirement that Cancel messages do not have an info block.

msgType Cancel could apply to the âeventâ instead and may be part of the new event information construct for CAP

Current practice in widespread use is to use an info block with a Cancel to explain the reasons for the cancellation. Clarify whether Cancel is appropriate for this case, or should msgType Alert be used. Clarify how to specify expires times in these cases.

Clarify how to use Cancel with responseType AllClear, noting Cancel practices had evolved out of the lack of All Clear in prior CAP versions.

From the Issues List: https://issues.oasis-open.org/browse/EMERGENCY-100:

Proposal:

msgType

cap.
alert.
msgType.
code

The code denoting the nature of the alert message (REQUIRED)

Code Values:
"Alert" - Initial information requiring attention by targeted recipients
"Update" - Updates and supercedes the earlier message(s) identified in <references>
"Cancel" - Cancels (repudiates) the false alarm in the earlier message(s) identified in <references>
"Ack" - Acknowledges receipt and acceptance of the message(s) identified in <references>
"Error" - Indicates rejection of the message(s) identified in <references>; explanation SHOULD appear in <note>

From the latest version of Practices Committee Note that I have:

3.4 Alert cancels

Historically, there has been some confusion as to what cancel means, and in practice it has been used for different purposes. Update and cancel have both been used since the beginning to end an alert message from playing. Cancel can do it at the alert block level whereas update does it at the info block level with the expires and/or responseType elements. But because these elements are optional, some recipients look to cancel only, thinking this is the "de facto" standard practice.

TBD examples for both practices.

That's all I have on this.

Rex

On 5/8/2019 11:01 AM, elysajones@yahoo.com wrote:

Please see question from Mike Gerber regarding the earlier discussion on the use of âCancelâ. I recall this discussion but do not recall the resolution. I also do not see it in the âElementsâ guidance. Elysa

Â

From: Mike Gerber - NOAA Federal <mike.gerber@noaa.gov>
Sent: Wednesday, May 8, 2019 10:28 AM
To: Elysa Jones <elysajones@yahoo.com>; Botterell Art <art@botterell.net>
Subject: CAP Cancel question

Â

Elysa/Art,

Â

At one time, OASIS discussed clarifying the use of CAP msgType "Cancel". What this ever codified/placed into policy anywhere?

Â

Thanks.

--

Mike Gerber
National Weather Service
Office of Dissemination

-- 
Rex Brooks
Starbourne Communications Design
Email: rexb@starbourne.com
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1361 Addison St. Apt. A
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