Re: [xdi] Multiplicity questions

[Michael Schwartz <mike@gluu.org>]

Markus,

I think the plan was to say that the values are ordered lowest-->highest, 
not sequentially. So there was never any assumption on my part that all 
integers would be present.

thx,

Mike



On Mon, 2 Jul 2012, Markus Sabadello wrote:

> Okay, makes sense to me.
>
> In this case however the spec should at least say that the $!1, $!2, $!3
> pattern is just one possible way to do it, and that GUID-style I-Numbers
> are also possible.
>
> And no implementation should rely on the $!1, $!2, $!3 pattern, or we'll
> have interoperability problems.
>
> Markus
>
> On Mon, Jul 2, 2012 at 7:24 PM, Michael Schwartz <mike@gluu.org> wrote:
>
> > Markus,
> >
> > I think this is a question about convention. I don't think we need any
> > proposal in this area.
> >
> > - Mike
> >
> >
> >
> >
> > On Mon, 2 Jul 2012, Markus Sabadello wrote:
> >
> >  Example:
> > > =markus$*(+email)$!1/!/(data:,**aaa)
> > > =markus$*(+email)$!2/!/(data:,**bbb)
> > > =markus$*(+email)$!3/!/(data:,**ccc)
> > >
> > > I was wondering.. If you first delete let's say the $!2 value, and then
> > > add
> > > a new value, does the $!2 get recycled?
> > > Or does the counter always keep going up, i.e. $!4 would be issued, even
> > > if
> > > $!2 is unused?
> > >
> > > I think I-Numbers should not be recycled for new values, and new ones
> > > should always be issued.
> > >
> > > So, I think an extra statement should be introduced to remember the
> > > I-Number of the last value:
> > >
> > > =markus$*(+email)/$!/$!3   <-- last I-Number
> > >
> > > With this statement it gets much easier and more efficient for the server
> > > to add a new value of +email.
> > >
> > > Or perhaps it would be even better to used GUID-style I-Numbers, then the
> > > question of increasing the counter becomes obsolete.
> > > Or perhaps the spec should not specify this, i.e. you could either use
> > > sequential I-Numbers, or GUID-style ones, whatever you prefer.
> > >
> > > At XDI2 we need this for implementing link contracts and the policy
> > > context
> > > nodes, which use the multiplicity format.
> > >
> > > If this looks right, I'll create a Proposal page.
> > >
> > > Markus
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