Hello again!
I see this could be a solution as well, however, I would like share with
you some thoughts:
1) The use of "!" (bang) was originally designed to be
similar to the use of "ip addesses" (maybe I'm getting wrong
here, in case please correct me :-), so thinks like !203.173.1276.1663
were permitted. This is obviously a misleading semantics as "
!203.173.1276.1663" is more an identifier than a number. What do you
think?
2) Actually, I see a slightly different meaning for the two
statements:
=markus/+email!1/"
"
and
=markus+email/$num$1/"
"
Try to explain my concern (that's a bit hard!).
In the first statement, it's like as the concept +email in itself has
subspaces for !1, !2, etc. As far as I've understood, by concatenating
two subsegments the second one assumes a meaning related to the first
one, so it's like to have the email, taken as concept (+email), having
some multiplicity in its own.
In the second statement, instead, we just use $num an integer in order to
index one of the +email attributes kept by =markus, which exist because
they've been explicitly declared as such (Markus' attributes). They
wouldn't exist otherwise.
It's somehow like the java statements:
Person markus;
markus.email=new Email[]
{"
","
"};
Email selectedMail=markus.email[1];
But maybe I'm getting wrong here as well, so you comments will be more
than welcome! (and sorry if maybe it sounds a bit too
"philosophic"!)
Bests,
Giovanni
At 18.41 29/01/2008, Markus Sabadello wrote:
Heya Giovanni,
I think the idea of having a way to express ordered collections in XDI
would be very useful...
We came across a similar problem a few days ago.. How do we express
multiple values for a predicate? For example, =markus could have multiple
e-mail addresses. We came up with the following idea:
=markus/+email!1/"
"
=markus/+email!2/"
"
But your pattern would work too:
=markus+email/$num$1/"
"
=markus+email/$num$2/"
"
A third idea Drummond had was to use inner graphs, like this:
=markus
+email
/
$
$1
"
"
$2
"
"
I like all three methods.. But we should probably decide on one of them..
Or just experiment for a while and see what works best...
Markus
On 1/29/08, Giovanni Bartolomeo
<
> wrote:
Hello,
some new inputs about this issue:
>* Markus asked if $num is always used in conjuntion with $has
predicate, or
>if there would be other uses? Giovanni said it would also be
useful
>standalone.
I think that $num could be useful also in accessing arrays,
vectors
and similar structures what we could call "ordered
collections".
Let's consider again this use case:
=football.team/$has$num$11/+player
@as.roma.calcio/$is$a/+football.team
we could index each player using $num${x} as follow:
@as.roma.calcio+player/$num$0/=curci
...
@as.roma.calcio+player/$num$7/=derossi
...
@as.roma.calcio+player/$num$10/=totti
etc.
Do you think this capability could be of help for XDI?
BTW maybe we can avoid the prefix $num and leave only ${num},
e.g.
$0, $5, $7 are valid XRIs which represent the number 0, 5,
7.
What do you think?
Bests,
Giovanni
Internal Virus Database is out-of-date.
Checked by AVG Free Edition.
Version: 7.5.516 / Virus Database: 269.19.7/1233 - Release Date:
19/01/2008 18.37
