Adding the following discussions
to the agenda.
The issues with using container
classes rdf:bag and rdf:list, which are discouraged by Nepomuk working group
(see an excerpt from http://www.semanticdesktop.org/ontologies/nrl/#2.3.3_Grouping_resources
below).
2.3.3 Collections
and Containers
Container classes are deprecated because the semantics of
containers are not clear and they are also difficult to handle. The sole use of
either containers or collections is sufficient to model grouped resources.
Since the semantics of collections are clearer, the use of containers is
discouraged in favour of collections.
1. rdf:Bag is a container
class whose use is discouraged.
2. rdf:Alt is a container
class whose use is discouraged.
3. rdf:Seq is a container
class whose use is discouraged.
4. rdfs:Container is the
superclass of rdf:Bag, rdf:Alt and rdf:Seq, and is not applicable to any other
RDF/S or NRL element.
5. rdfs:ContainerMembershipProperty
is used to indicate the membership of rdf:Bag, rdf:Alt and rdf:Seq, and is not
applicable to any other RDF/S or NRL element.
6. rdfs:member is a super
property of the container membership properties, and is not applicable to any
other RDF/S or NRL element.
Recommendation: The use elements numbered
[1] through [6] is strongly discouraged.
Although the use of container classes and properties is
discouraged, resources can still be grouped using [RDFS Collections]
constructs.
1. rdf:List is a class that
can be used to build descriptions of collections. A collection typically is
composed of one or more lists.
2. rdf:first is a property
that relates a list to its first element.
3. rdf:rest is a property
that relates a list to the rest of the elements excluding the first element.
The rest of the elements are in the form of another list.
4. rdf:nil is a property that
can be used to create an empty list. This is usually the last list in a
collection.
Recommendation: The combined use of
elements numbered [1] through [4] is encouraged as an alternative to container
elements
Also discuss an earlier comment
by Siegfried in June 24 TC meeting.
Siegfried commented that Nepomuk
ontology uses the cardinality nrl:minCardinality and nrl:maxCardinality from
NRL, which is a RDF/S extension. NRL addresses several limitations of current
Semantic Web languages, especially with respect to modularization and
customization.
Regards,
Eric
From: Eric Chan
Sent: Tuesday, September 01, 2009 4:52 PM
To: icom@lists.oasis-open.org
Subject: Agenda for ICOM TC Meeting on September 2, 9:00 - 10:00 AM PDT
Agenda
1. Roll Call
2. Approve draft minutes from August 19 TC Meeting
http://www.oasis-open.org/apps/org/workgroup/icom/email/archives/200909/msg00000.html
3. Review the minimal model of community, workspace, folder,
artifact, and other high-level concepts (given below) for representation in RDF
(model source file attached)
4. AOB
Please sign on to ICOM TC chat room
http://webconf.soaphub.org/conf/room/ICOM-TC
Biweekly ICOM TC Meeting Conference Call Info:
Date: Wednesday, 2 September, 2009
Time: 09:00am - 10:00am PDT
Event Description:
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Best regards,
Eric