Re: [RAM] Ramblings about "locator"

> - Do you have to get a new one when you move?

IMO that is all you need to tell a loc from an id.

Thanks,
Peter

--- Noel Chiappa <jnc@mercury.lcs.mit.edu> wrote:

>     > From: Brian E Carpenter <brian.e.carpenter@gmail.com>
> 
>     > My original RAMble (sorry) ended thus:
> 
>     >  Maybe the essential point is that a locator can at least in
>     >  principle be mapped to topology and an identifier can't.
> 
> My human-name can be mapped to a telephone number. My human-name is not,
> however, a telephone number. An "identifier" can certainly be mapped to a
> network location with the aid of the appropriate database, just as a DNS
> name can be mapped to a network location.
> 
> Maybe you're using the wrong word, and instead of "mapped" you really meant
> something like 'directly related', or something like that, but the problem
> is that that's a somewhat nebulous turn of phrase. Which is why I
> previously suggested that nice gold-standard, easily-comprehendable tests
> for 'does this name have location information embedded in it' are:
> 
> - Do you have to get a new one when you move to a new location?
> - Given two location-based names, can you tell, by comparing *just the
> 	names*, whether they are 'close' to each other?
> 
> Maybe someone else can come up with a snappy word/phrase which clearly,
> cleanly and concisely embodies that very close relationship...
> 
> 
>     > A slightly different way to say it is that a locator is a handle for
>     > a route.
> 
> No. My street address is not a handle (in any simple sense) for directions to
> my house. Yes, with a lot of data (connectivity information), and a certain
> amount of computing, it can be turned into directions, but the relationship is
> not a simple one.
> 
> This was all quite clear a long time ago; see IEN-19, John Shoch,
> "Inter-Network Naming, Addressing, and Routing", January 1978, now finally
> available at:
> 
>     ftp://ftp.isi.edu/in-notes/ien/ien19.txt
> 
> Everyone here should be familiar with what it has to say.
> 
> 	Noel
> 
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