Re: [xdi] on global cross references and the link contract use case

Hi Giovanni -

A cross reference is putting the thing cross referenced inside the context of the xri that contained the cross reference.  Terminology in this proposal has been changing but the thing that hasn't is that in both cases the outer authority is returning its xrd for the reference.  That is, in the example below, cordance is returning its xrd for =drummond. 

@cordance=drummond
@cordance*(=drummond)

So we only support the 'inside' (or better stated container) concept.  Now it may be interesting to consider a resolution process which rather than asking @cordance for =drummond we ask = for drummond.  Today that does not exist.

Have a happy thanksgiving.

Thanks

Les

--------------------------

http://xri.net/=les.chasen

From: Giovanni Bartolomeo 

To: Chasen, Les

Cc: XDI 

Sent: Wed Nov 26 09:35:43 2008
Subject: RE: [xdi] on global cross references and the link contract use  case

Hello Les,

First, thank you for having read the contribution! Unfortunately I'm
probably not the best person which can answer your question, as I'm not
an expert of XRI2.0. I limited to develop my contribution in the scope of
the current proposal
(
http://wiki.oasis-open.org/xri/XriThree/GcsDelimiter), which, I
personally support for one specific reason:

http://lists.oasis-open.org/archives/xri/200811/msg00043.html.

I think Drummond's reply

http://lists.oasis-open.org/archives/xdi/200811/msg00031.html is a
good technical explanation of this, expecially the last statement: in
an ordered set, you are not referencing across contexts. The context is
the ordered set itself. For example, in $sig$d, the context for $d is
$sig. Which I understand as follow: put an object inside a context is
not exactly the same as referencing it from that context). 

The core of this issue - that's my guess and not a technical explanation
-  is probably that XRI2.0 did not consider the need to "put an
instance of an object inside a context", but just to
"cross reference" it. That is instead a fundamental capability
for XDI (and for any human or machine understandable language).

I'll be happy to answer any further questions you might have on the
contents of the contribution itself.

Kind Regards,

Giovanni

At 13.36 25/11/2008, Chasen, Les wrote:

Hi Giovanni.  I had a
chance to read this.  While I like what you guys

are doing with link contracts I fail to understand why all of these

examples do not work with XRI 2.0 style cross references.  

> -----Original Message-----

> From: Giovanni Bartolomeo
[
mailto:]

> Sent: Wednesday, November 19, 2008 12:02 PM

> To: XDI

> Subject: [xdi] on global cross references and the link contract
use

> case

> 

> Hello,

> 

> some weeks ago I mentioned that I was playing a bit with the

> semantics of link contracts. Better to say, with the global
cross

> references applied to the link contract use case. After the issue
of

> XDI RDF model v.11, I put my thoughts in a document which you can
find

> below.

> Maybe just semantic nuances, but your comments will be welcome.

> 

> Thanks,

> Giovanni

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