Re: [Uri-review] Request for URI schemes assigned to OPC UA

Graham Klyne <gk@ninebynine.org> Tue, 23 May 2017 09:07 UTC

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Date: Tue, 23 May 2017 10:07:11 +0100
From: Graham Klyne <gk@ninebynine.org>
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To: Randy Armstrong <randy.armstrong@opcfoundation.org>, "uri-review@ietf.org" <uri-review@ietf.org>
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Subject: Re: [Uri-review] Request for URI schemes assigned to OPC UA
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I have two objections here to permanent registration:

1. The specifications appear to be non-open "Note: Access to specifications and 
developer resources are available to OPC Foundation members only."

2. The use of multiple URI schemes to access the same resource goes against 
principles of web architecture [http://www.w3.org/TR/webarch/#uri-aliases].

This topic has been discussed previously on this list: see thread at [1].

[1] 
https://mailarchive.ietf.org/arch/search/?email_list=uri-review&gbt=1&index=ze2I30iloSGZxlP2vAeCWcPOWus

#g
--



On 22/05/2017 22:04, Randy Armstrong wrote:
> Scheme name:
>
> opc.tcp       :  OPC UA Connection Protocol over TCP/IP
> opc.amqp  :  OPC UA Connection Protocol over AMQP
> opc.wss      :  OPC UA Connection Protocol over WebSockets
>
> We expect to add new schemes as time goes on.
>
> Status:  permanent
>
> Applications/protocols that use this scheme name:
>
> Applications which implement the OPC UA Connection Protocol defined by the OPC Unified Architecture specification:
> https://opcfoundation.org/developer-tools/specifications-unified-architecture
>
> The opc.tcp scheme has been in use in the field for about 10 years (we were unaware of the registration process).
> Note that the OPC Foundation has a trademark on the term "OPC" (see US Trademark #78732560)
>
> Contact:
> Randy Armstrong
> tcb@opcfoundation.org
>
> Change controller:
> OPC Foundation
> https://opcfoundation.org/
>
> References:
> The protocols and schemes are defined in Part 6: Mappings:
> http://www.opcfoundation.org/UA/Part6/
>
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