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Subject: RE: [emergency] EDXL-DE routing and valueListUrn


Let's learn this lesson and make it a highlight of the 
cookbook-implenter's guide. Everyone who implements a critical 
standard needs to understand this, and, we should definitely 
recommend a best practice of having a local copy of the standard with 
the installation of any application that implements the standard and 
recommend the use of a customized schemaLocation-specific version of 
the app for the installation. That doesn't mean we don't also use a 
urn because even a local copy can be on a machine that goes down or 
is temporarily commandeered by another application in a dynamic 
provisioning system. This is one of those things I just thought 
everyone did until it bit me in the assets.


At 7:14 PM -0500 3/21/06, Ham, Gary A wrote:
>Renato has it exactly right.  If the identifier resolves to a specific
>URL only, systems will have difficulty if the URL is down for any
>reason. But the party responsible for a URN can make the resource
>available in multiple ways, even sneaker net, if necessary (as is often
>done when crossing from unclassified to classified systems).  Ideally,
>you might want to associate a URN with a source URL, but only as an
>authoritative reference, because most of the time using the URL is just
>a lot of extra work retrieving a foreign source that could be kept
>For the EDXL-DE, in particular, the value is in the URN as a unique
>identifier that tells me whether I know how to process the content or
>not.  If I don't know the URN, I cannot do specialized processing. If I
>do, I can. It is as simple as that.
>Gary A. Ham
>Senior Research Scientist
>Battelle Memorial Institute
>540-288-5611 (office)
>703-869-6241 (cell)
>"You would be surprised what you can accomplish when you do not care who
>gets the credit." - Harry S. Truman
>-----Original Message-----
>From: Renato Iannella [mailto:renato@nicta.com.au]
>Sent: Tuesday, March 21, 2006 7:00 PM
>To: Ron Lake
>Cc: Emergency_Mgt_TC TC; David Ellis; SIA Pilot-6; Harry Haury;
>Haleftiras, Pericles; Carl Reed OGC Account; Glaser, Ronald
>Subject: Re: [emergency] EDXL-DE routing and valueListUrn
>On 22 Mar 2006, at 09:41, Ron Lake wrote:
>>  My view is that it should - else how do you know what it means?
>>  In effect you are saying that a URN "resolves" to a text description
>>  somewhere but the somewhere is not defined?
>Agree, but there is role for unique identifiers.
>For example, the EDXL-DE XML Schema has this unique identifier:
>     urn:oasis:names:tc:emergency:EDXL:DE:1.0
>You could resolve this to a URL (to get the actual XML Schema file) but
>it does not (yet). It is up to the registrant of the namespace
>identifier to provide these services.
>Cheers...  Renato Iannella
>National ICT Australia (NICTA)
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Rex Brooks
President, CEO
Starbourne Communications Design
GeoAddress: 1361-A Addison
Berkeley, CA 94702
Tel: 510-849-2309

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