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Subject: Groups - DRAFT-03-07-13-Minutes-RIM-Subcommittee-1.doc uploaded

Submitter's message
Please review these minutes from the March 7, 2013 meeting of the Reference Information Model Subcommittee for approval at our next meeting, subject to any specified changes. Thanks!
-- Jeff Waters
Document Name: DRAFT-03-07-13-Minutes-RIM-Subcommittee-1.doc

At the March 7, 2013 meeting of the Reference Information Model
Subcommittee, the members discussed the following topic:

1. TOPIC: Refined Guidance for Standards Developers regarding when to use
Enumerations v. ValueLists v. Layers:

(a) If there is a reasonable default enumeration for a required element,
use the enumeration, but make sure the enumeration includes ?UNKNOWN? and
?EXTENSION?. Users should only use ?UNKNOWN? when they truly do not know
the value. Users should use ?EXTENSION? when the defaults are so far off
the intended meaning that no reasonable default value can be chosen and the
local community value is provided in an extension ?layer?.

(b) If there isn?t a reasonable default enumeration for an element, use a
ValueList. (Here you are expected to use a local ValueList to implement
your local community needs.)

(c) Allow for (zero or more) "Layer" elements in your new standard,
utilizing the "Layer" element and structure defined in the CommonTypes.

The point of this guidance is to encourage use of default values in the
body of the standard and place the local community values in the extensions
enabled by the Parameter Name/Value fields (i.e. Layers). This maintains as
much interoperability as possible for recipients unfamiliar with the local
community values but also provides flexibility for local communities to use
their own terminology for those who understand it.

(1) Norm Paulsen's ?Environment Canada Layer? document summarizing the
?Layers? concept:

(2) Doug Allport's email summarizing ?Layers?:

(3) Draft ?EDXL Extensions? document, summarizing and proposing the use of
?Layers? as one of two primary EDXL Extension mechanisms along with

(4) A draft implementation of the DE 2.0 with ?Layers? (but not yet revised
to comply with the enumerations guidance above and utilizing a draft
implementation of a ?Layer? element in the common types schema)

(5) The DE 2.0 Basics White Paper, revised to include the ?Layers? concept
(but not yet revised to comply with the enumerations guidance above)

(6) More information on the ?Layers? concept can be found at the website of
the Canadian Association for Public Alerting and Notification
(http://www.CAPAN.ca )
Download Latest Revision
Public Download Link

Submitter: Jeff Waters
Group: EM Reference Information Model SC
Folder: Meeting Notes
Date submitted: 2013-03-07 17:58:26

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