Joint Committee Minutes 9 October 2001
This page summarizes the telecon for the Joint US/EU
Committee on Agent Markup Languages
held from 1300 to 1400 PDT on 9 October 2001.
These minutes were prepared by the chairman,
and were approved during the 23 October telecon.
- Harold Boley
- Dan Connolly (joined late)
- Mike Dean
- Stefan Decker
- Richard Fikes
- Frank van Harmelen
- Sandro Hawke
- Pat Hayes
- Jeff Heflin
- Ian Horrocks
- Deb McGuinness
- Peter Patel-Schneider
No announcements this week.
Last Week's Minutes
The minutes from October 2 were approved by those present.
Semantic Web Course Materials
Several folks offered to share (with attribution) materials
they've developed for Semantic Web courses
and industrial presentations
is collecting educational resources
as part of the
NSF/EU Semantic Web Workshop
Frank, Deb, Stefan and others reported on the
held last week in Nice, France.
The goal was for current researchers to
brief the government representatives on the research agendas should be.
There were about
~15 presenters (several US presenters cancelled due to
concerns about travel).
NSF is interesting starting a Semantic Web activity but
the representative there was very new.
They are likely to organize a follow-on workshop.
The EU representatives
(the folks who sponsored
and other efforts)
are currently writing
a larger "framework" for the next 5-year period (2003-2008).
After the presentations,
the group divided into
4 working groups:
- language and inference
(Frank provided a
(Stefan provided a
- KA and modelling
- ontology management
Pat and Peter discussed their recent work on the RDF(S) and DAML+OIL
for those that weren't present
Pat noted that the current
will be replaced shortly,
pending decisions regarding literals.
Frank complimented Pat on writing an "eminently readable document" and noted that we should produce more documents like this.
Peter identified 2 issues in layering the DAML+OIL MT over the RDF(S) model theory:
- the DAML+OIL disjointness of objects and datatypes
(due to undecidability) is hard to
fit with RDF Resources and Literals
- the RDF(S) MT employs a fixed mapping from Literals to literal values,
while DAML+OIL can map a literal value into any of the types it could match
Dan Connolly noted that the current DAML+OIL documents
don't contain the disclaimer
expressing our discomfort with the disjointness of objects and datatypes
(but it's the best we currently know how to do)
that we had planned to add.
RDF(S) Data Types
Peter discussed his recent work
on RDF(S) datatypes.
He plans to send out a message shortly.
He was originally looking for Joint Committee support,
but is now comfortable proposing as an individual.
As noted above,
a DAML+OIL "literal" can match any of the types it could match,
and may be contrained by a subsequent restriction.
In RDF(S), it has only one meaning.
Peter's new Model Theory is slightly cleaner
previous DAML+OIL Model Theory,
excising some obfuscation with
XML Schema datatypes that are hard to reason about
(e.g. multiple numeric types),
but is compatible with the previous DAML+OIL Model Theory.
XML vs. RDF
There was some discussion about the (changing) relationship between
XML and RDF,
which has come up at the EU/NSF meeting and elsewhere.
Originally RDFS was intended for domain models,
while XML Schema was intended for document models.
These are now converging.
Dan Connolly fees that the
biggest difference between RDF and XML is the
inability to merge XML documents.
Ian suggested the name "XML Ont",
and Deb suggested that this should be the
name for the product of the proposed W3C WebOnt WG.
(a Lucent colleague "across the hall" working on XML Query)
are looking at a merge of XML and RDF.
Peter noted that the
XML Query and XPath Data Model
is much richer than RDF, including ordering, etc.
Harold Boley is also
on unifying data models
(where XML is a special case of RDF).
Pat Hayes is also working on a unified logical notation with a common
semantics/model theory that can project to XML, RDF, KIF,
Several members will be en route to the
Rapid Knowledge Formation (RKF)
PI Meeting next week.
We'll plan to have at least a short telecon, anyway,
particularly in case there is any news on WebOnt.
On October 23,
we'll plan to discuss
During some future telecon,
we'll discuss the
XML Query Data Model.
ACTION (DanC): send information on the XML Query Data Model to the group
Kelly Barber's raw notes
last week's minutes
Joint Committee home page
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