RE: [xri] Link Back?

["Drummond Reed" <drummond.reed@cordance.net>]

Nat,

I believe where we are with regard to XRD2 linking back to XRD 1.0 is
"profound simplicity". By that I mean that the backlink in XRD2 is nothing
more than an <XRD:Subject> value that resolves back to XRD1.

Another way to say it is that XRD linking involves two basic cases:

1) Independent linking.

2) Dependent linking.

INDEPENDENT LINKING

With independent linking, XRD1 has <XRD:Subject> value #1 (within the scope
of XRD signing authority #1), and XRD2 has <XRD:Subject> value #2 (within
the scope of XRD signing authority #2). The only link is a forward link from
that XRD1 contains an <XRD:Link:URI> that resolves to XRD2 (and OPTIONALLY
that link contains and <XRD:Link:Subject> whose value is equivalent to
<XRD:Subject> value #2).

In this case, XRD1 has an independent link to XRD2, but XRD2 has no backlink
to XRD1. With this scenario, any number of XRD1s can point to XRD2, and all
the links will still validate, because XRD2 is entirely independent.

DEPENDENT LINKING

With depending linking, XRD1 has <XRD:Subject> value #1 (within the scope of
XRD signing authority #1), and XRD2 has ***the same*** <XRD:Subject> value
#1. In this case, XRD 1.0  indication of a link is that XRD1 contains an
<XRD:Link:URI> that resolves to XRD2 (and OPTIONALLY that link contains and
<XRD:Link:Subject> whose value is equivalent to <XRD:Subject> value #2).

> -----Original Message-----
> From: Nat Sakimura [mailto:n-sakimura@nri.co.jp]
> Sent: Monday, July 06, 2009 4:41 PM
> To: XRI TC
> Subject: [xri] Link Back?
> 
> Hi.
> 
> Just wanted to know what is the status for link back from XRD2 to XRD1.
> 
> I have seen a lot of discussion for forward linking XRD1 to XRD2,
> but I am not so sure about XRD2 back to XRD1.
> 
> Presumably, we can just define <rel> that signifies the link back,
> but have we defined or discussed it?
> 
> Regards,
> 
> =nat
> 
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