Minutes: XDI TC Telecon Thursday 1-2:30PM PT 2011-01-27

[Drummond Reed <drummond.reed@xdi.org>]

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

Date:  Thursday, 27 January 2011 USA
Time:  1:00PM - 2:30PM Pacific Time (21:00-22:30 UTC)

ATTENDING

Giovanni Bartolomeo
Bill Barnhill
Markus Sabadello
Joseph Boyle
Michael Schwartz
Drummond Reed

GUESTS

Cameron Hunt


THE GOTOMEETING FOR TODAY IS:
     https://www2.gotomeeting.com/join/969244355

THE IDEARPAD LINK FOR TODAY IS:
     http://xdi.idearpad.org/20


AGENDA

1) INTRODUCTION TO CAMERON HUNT

Cam has been active in using semantic technologies within the
enterprise. He began working on flexible data models in the enterprise
- specifically how to support user-driven dynamic data models. This
led to work with RDF and RDF rules engines. Most recently he
investigated integrating SPARQL into RDF rules engines.

He shared the perspective that he feels that RDF has never defined a
good way to express metadata on assertions. Secondly, he feels XDI
contexts map more directly and intuitively to topic maps. For these
reasons he would like to further explore XDI and help us define how we
can best build bridges and help provide solutions to the world of RDF.


2) REVIEW UPDATED XDI GRAPH PATTERN DOCUMENTS

Giovanni posted an updated version of his document:

   http://www.oasis-open.org/committees/download.php/40874/xdi-graph-wrapping-up-v2.doc

Drummond is working on a new version of his graph pattern example
document and apologized that he was not able to complete and upload it
before the call.

Giovanni went through his document to explain the XDI graph model and
how it operates as an extension of the RDF graph model.

One point we drilled down on is the ability to refer to the same real
world entity in different contexts. This is different than owl:SameAs.
Giovanni explained how it is actually the same concept expressed in a
paper submitted to the RDF Next Steps workshop that called the use
case "same as, different context". Cam agreed with us that the XDI
model solves this cleanly.

Cam also had some suggestions about how XDI can potentially can solve
performance problems related to some RDF graph structures.

As we finished reviewing Giovanni's document, we talked about the
importance of metadata. Cam said that this issue is in fact a very
important one within the RDF community, since the challenge of
metadata (including versioning), is one that causes challenges in many
implementations. Cam felt this is an area where there may be the most
initial interest in XDI from the RDF community.


3) DISCUSSION OF NEW WEEKLY IMPLEMENTATION CALL

Mike gave Cam and the rest of the TC an overview of the proposed open
source project that will be discussed on the weekly implementation
call starting tomorrow at noon Pacific.

Mike reviewed the email he sent to the list of the key project
components. He then described the Poken use cases that Gluu wants to
implement.

This led to a discussion of XDI link contracts and their use as a
portable authorization mechanism. Cam made the point that such a
mechanism has uses well beyond identity-to-identity authorization.
Specifically he cited managing permissions and authorizations for
resource objects within enterprises as they go through their entire
lifecycle.


3) DISCUSSION OF XDI LITERAL ADDRESSING

The following thread describes this issue and some proposed solutions.

   http://lists.oasis-open.org/archives/xdi/201101/msg00026.html
   http://lists.oasis-open.org/archives/xdi/201101/msg00029.html
   http://lists.oasis-open.org/archives/xdi/201101/msg00030.html

We ran out of time to discuss it but will put in on the agenda for next week.


4) NEXT CALL

The next call is next week at the regular time. Drummond will be
attending the Conversational Commerce Conference (C3) and may not be
able to attend, but he will try, and will send an agenda in any case.


------------
ONGOING ISSUES LIST

Each of these is a candidate for the agenda for future calls.

* PROPOSED CONSTRUCTS/OPERATORS FOR XDI

Discuss the following wiki page originally posted by Giovanni:

  http://wiki.oasis-open.org/xdi/XdiNewFoundation

* DICTIONARY STRUCTURE

Mike would like an example of the PDX dictionary as soon as we can do it.

*   EQUIVALENCE SEMANTICS

Close on whether we need an additional $ word that is the equivalent
of Higgins Personal Data Model (PDM)  semantics   of h:correlation,
which is not as strong as $is.

      http://lists.oasis-open.org/archives/xdi/201006/msg00036.html

* COOL URIS

Continue previous discussion about the use of standard RDF URIs in XDI:

  http://lists.oasis-open.org/archives/xdi/201006/msg00023.html