Hi Wendy,

I find this proposal very useful and agree with the simplicity of having 
attributes rather than capabilities. 

Here are some questions hoping they're clear:

- section 1.1: I didn't get the meaning of  "A client deduce attributes by 
using the resource. Capabilities cannot be deduced"

- In the example IRD and sections 3.3 there are 2 terms: 
"authoritative-prefixes" and "authoritative-exclusions" that are sets of 
prefixes.  In Section 3.4 they are characterized by 3 points (i.e. more 
detail). Section 3.4 then  "define the authoritative set with two sets of 
prefixes, one  inclusive, the other exclusive".  Does this mean that the 
"inclusive" set is the "authoritative-prefixes" set? 

- section 5: 
* I'm fine with using "attributes" as I understand this term expresses that 
there is additional information on the resource object  e.g. "xxx-map"
** w.r.t. the term authoritative, then how about integrating the term 
"provider" in the attribute to form something like "provider-prefixes-incl" or 
"provider-documented"?  

- in general: if we take the set of "authoritative-prefixes": is it possible 
one of these sets, say "1.2.0.0/16",  a specific level of detail is provided, 
that is not provided on another set of the "authoritative prefixes", say a 
particular endpoint cost on metric or property. If yes, can the IRD advertise a 
resource "numerical-metricX-cost-map" available on some custom sub-domain that 
would have an attribute like "authoritative prefixes" : "1.2.0.0/16". This 
would offer flexibility and scalability to the provider of the ALTO Server and 
allow the client to get directly to the focused information instead of having 
to download and cross-match large  cost-maps. 

Thanks,
Sabine

>>-----Message d'origine-----
>>De : alto [mailto:[email protected]] De la part de Wendy Roome
>>Envoyé : mercredi 8 octobre 2014 21:32
>>À : IETF ALTO
>>Objet : [alto] Resource Attributes -- new draft
>>
>>I just submitted a draft proposal
>>(https://datatracker.ietf.org/doc/draft-roome-alto-resource-attr/) for
>>providing additional descriptive information for ALTO services. The
>>draft defines both the mechanism and an initial set of attributes.
>>While capabilities tell you want kind of resource this is, and what
>>optional features it supports, attributes tell you how this resource
>>differs from other resources of the same type.
>>
>>Hopefully we can discuss this in November.
>>
>>      - Wendy Roome
>>
>>
>>
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