Whoops -- I meant [9.1.2] should say that an ALTO server must provide
'numerical' OR 'ordinal' mode, not that a server must support both!

Related question: Do we really need to require that all ALTO servers support
a Cost Type named 'routingcost'? Suppose I have an ALTO server that provides
a custom Cost Type to a select group of authorized clients. None of those
clients need 'routingcost'. Why must my server support a Cost Type that no
client will ever use? So I'd be happy to drop that requirement altogether.

Aside: My design philosophy is Libertarian, so I tend to challenge "MUST"
requirements. I think they should exist only if they are absolutely
necessary for interoperability.

- Wendy Roome

From:  "Y. Richard Yang" <[email protected]>
Date:  Mon, March 18, 2013 15:12
Subject:  Re: [alto] minor inconsistency in draft 14

Hi Wendy,

So you think each implementation MUST provide both numerical and ordinal
modes for the 'routingcost' metric. I believe that this is true for all
existing implementations, and hence a useful requirement.

If no objection from others, we should add this to ensure interop.

Thanks!

Richard

On Mon, Mar 18, 2013 at 10:38 AM, Wendy Roome <[email protected]>
wrote:
> We've worked hard to allow ALTO servers to use ordinal mode instead of
> numerical mode. However, Section "9.1.2 Cost Maps" (first paragraph, last
> sentence) says:
> 
>         This resource MUST be provided for at least the
>         'routingcost' Cost Type and 'numerical' Cost Mode.
> 
> 
> I think that should read
> 
>         ... Cost Type and either 'numerical' or 'ordinal' Cost Mode.
> 
>         - Wendy Roome
> 
> 
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