RE: Comment on latest CT Guideline Document

Heiko: "allow/deny" are intended as better terminology alternatives to "white/black", e.g. more clear as to the intent of the designation

Jo: the point of including these clarifications is that in some cases the CT proxy will not be able to reliably depend upon semantic means of discovering which sites should and should not be transformed (and how). An allow/deny list is a practical way of supplementing the decision process, and a common practice by WAP proxy/gateway vendors for example. There is certainly a process of list management, that is typically outside standards scope, and the CT operator is responsible for the simplicity of the process (a business decision in the end). It does not have to involve "great difficulty" (a simple web form on a CT proxy operator's developer/CP support site is all that is needed). If the CT recommendations do not include this as an option, it must certainly at least *not* prohibit it: vendors must have the freedom to meet customer (CT proxy operator) requirements without being called "non-compliant", if compliance to W3C recommendations is considered important.

Best regards,
Bryan Sullivan | AT&T

-----Original Message-----
From: [] On Behalf Of Jo Rabin
Sent: Wednesday, June 11, 2008 8:19 AM
To: Gerlach, Heiko, VF-Group
Subject: Re: Comment on latest CT Guideline Document

I think we have a terminology problem here, I assume that what you're saying is that an "allow list" (i.e. a list of sites for which transformation is allowed) should be recommended practice? I don't think I agree, anyway, in that it means that the CP then has great difficulty in getting changes to the behaviour of their site noticed.


On 11/06/2008 13:45, Gerlach, Heiko, VF-Group wrote:
> Hi All,
> Page 7,
> 1) Does Allow and Disallow lists mean Black and White lists?
> 2) If so, I strongly recommend to support a white lists within the CT 
> Guidelines. We do not know owner/stakeholder of most of the websites 
> which are "non made for mobile". So we can not expect their support.
> But we can understand the customer needs and a customer could tell us 
> that content adaptation failed e.g. due to 200ok instead of 406.
> This is why I think we do need a white list. For Urls contained in 
> that whitelist, Content adaptation shall be done in that way that a 
> Mozilla User Agent (non mobile user agent) is setup instead of the 
> mobile user agent.
> This helps us to manage with the 406/200OK issue without buyin from 
> the site owner.
> Clarification:
> I agree that blacklists should be ommitted. But white lists will 
> deliver a clear advantage.
> *3.2.3 Control by Administrative or Other Arrangements.*
> The preferences of users and of servers* may* be ascertained by means 
> outside the scope of this document, for example:
>     * the use by transforming proxies of a disallow list of Web sites
>       for which Content Transformation is known to diminish the user
>       experience of content or be ineffective;
>     * the use by transforming proxies of an allow list of Web sites for
>       which Content Transformation is known to be necessary;
>     * terms and conditions of service, as agreed between the user and
>       the Content Transformation service provider.
> *Note:*
> Allow and disallow lists generally cause intractable problems for 
> content providers since there is no mechanism for them to establish 
> which lists they should be on, nor any generic mechanism though which 
> they can check or change their status.
> Cheers
> *Heiko Gerlach*
> *Vendor Manager / Product Owner*
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Received on Wednesday, 11 June 2008 15:37:10 UTC