Re: Notes from Non-meeting

Henning Schulzrinne <hgs@cs.columbia.edu> schrieb am 21.03.02:
> > This is true: we do not have unique identifier for people. But that doesn’t
> > hinder you to ask where “Jorge” is, although many call me
> > "Ricardo". If the problem is that the name
> > “Jorge” is not unique, well you could replace it by “Jorge.Cuellar@mchp.siemens.de” or whatever.
>
> Certainly, but we're not designing a generic directory protocol here.

We do not need a directory. All we need is that when I ask for the
location of target "ABC" the location server is able to know
which "ABC" this is. This "ABC" could be a nickname that I use in
this Location Server. It could also be the hash of a public key.
That gives you on the one hand anonynmity and on the other hand
a proof that you own this "purpose built identifier".
Of course, your pals
would have to know which NAI, e-mail address, nickname or
"purpose built identifier" you are using, but this is simple.

<snip>

> I didn't say you had to have *exactly one* identifier, but at least one.

This is how I read you original comment:
>make associations with people, buses, taxis or other objects. Wedon't
>have intrinsic identifiers for these objects, certainly not asingle
>one.
 
<snip>
 
> Again, the identifier doesn't have to be unique in the sense that one
> object can have multiple identifiers. But it gets hard if one identifier
> refers to multiple objects that may not always be in the same physical
> place.

Yes, you are right: this is a requirement! In the corresponding context
of this Location Server (or service) this ID has to point uniquely to one
target. And the target, or the owner, has to be able to prove that he owns this name (in this context). I can start immedialety listing many scenarios where this is true, we do not have to exclude them a-priori. It is one requirement!

> Also, you need at least one - location information without some
> protocol-representable idea of what it is for is pretty useless. This is
> another argument why this problem gets much easier if you embed location
> information in existing protocols since you usually already have means
> to identify objects of interest.

Still: this doesn't hinder you to ask where "John Morris" is.
And there are other protocols who talk about people and
attributes of people.

Regards,

Jorge
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Received on Thu Mar 21 18:15:31 2002