Minutes: XDI TC Telecon Thursday 1-2PM PT 2008-12-18

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

[My apologies for the long delay on these minutes - they got stuck in the
12" of snow we had in Seattle over the holidays. Thanks to Markus for
keeping notes during the call. =Drummond]

Following are the minutes of the unofficial telecon of the XDI TC at:

Date:  Thursday, 18 December 2008 USA
Time:  1:00PM - 2:00PM Pacific Time (21:00-22:00 UTC)

ATTENDING

John Bradley 
Markus Sabadello
Giovanni Bartolomeo 
Mike Mell
Drummond Reed (latter half)

GUESTS

Nick Nicholas (XRI TC)


1) XDI RDF GRAPHING

We talked about the new document posted by Drummond:

       PDF:
http://www.oasis-open.org/committees/download.php/30442/xdi-rdf-graphing-v1.
pdf
       Powerpoint:
http://www.oasis-open.org/committees/download.php/30441/xdi-rdf-graphing-v1.
ppt

Drummond could not attend the start of the call, so Markus explained what he
understood about that document. It lists of a few fundamental XDI RDF
constructs as XRIs and illustrates how they can be graphed.

Nick explained this was motivated by his trying to understand what XDI RDF
statements are generated by the proposed XRI 3.0 syntax. Specifically, one
of his goals was to understand the difference between $has and $has$a
statements.

Markus explained that the syntax generated from $has and $has$a statements
looks like this:

	+x/$has/+y --> +x+y
	+x/$has$a/+y --> +x/+y

Nick suggested that concrete examples would help. He said the example he was
working with involved "tables" and "legs". Legs are an integral part of a
table (composition). What XRI would illustrate this relationship between a
"table" and its "legs"?

Another key question is the meaning of parens. They put an XRI into a
different context, shown in the document with a bubble.

Drummond was able to join the call and explained that the XDI concept of
"contexts" and "sub-contexts" was motivated by the notion of contexts in the
Higgins open source project. Contexts turned out to be a useful construct
for graphing XDI RDF statements because they allow explicit modelling of the
RDF concept of a "named graph".

	http://www.w3.org/2004/03/trix/

Giovanni pointed out that Statement 6 in the xdi-rdf-graphing-v1 document is
not consistent with the link contract example found on page 33 of the
xdi-rdf-model-v11 document:

	
http://www.oasis-open.org/committees/download.php/29748/xdi-rdf-model-v11.pd
f

In that document, =drummond/$has/+friend$contract results in the XRI
=drummond+friend$contract, but it should be =drummond(+friend$contract).
Drummond agreed this should be changed in the next version.

UPDATE: In his study of the Statement 6 issue identified by Markus, Drummond
subsequently revised the proposed graph structure for compound $has
statements. This eliminates the issue identified by Markus and also removes
the inconsistency with the V11 XDI RDF Model document. V2 of the XDI RDF
Graphing document has been posted at:

	
http://www.oasis-open.org/committees/download.php/30457/xdi-rdf-graphing-v2.
pdf 


2) TIMING OF FIRST WORKING DRAFT

Drummond wants to get started with first working drafts over the holiday
break, depending on available time. An initial working draft does not have
to be anywhere near complete, so this will get the specification drafting
process started.


3) HOLIDAY TELECON SCHEDULE

There was consensus we should take a break over the holidays. We won't hold
calls over next two weeks - the next regularly scheduled call will be
Thursday January 8, 2009.