Martin,
I thought that a major merit of the CRM was that it was an abstract
model, which could be instantiated using whatever technology was felt to
be appropriate. That being the case, I would be concerned if
RDF-specific techniques were presented to the world as the only way in
which a particular challenge ("implementing argumentation systems ...")
could be tackled using the CRM. Or are you talking specifically about
RDF implementations of the CRM?
Why can't "premises and conclusions" be modelled using reification, so
they can then be given a unique URI? This is the sort of approach which
the BM has successfully deployed, as I understand it. I would be
grateful if someone could provide a really simple concrete example which
shows the need for the named graph approach.
To pick up on the suggestion of using the AAT as an example: in what way
is the AAT a named graph? Surely it's a SKOS Concept Scheme (plus)? I
think it would be impossible to give an example of a "well-known" named
graph, for the reasons Simon has been explaining.
Richard
On 25/07/2014 20:25, martin wrote:
Dear Richard,
At least in the implementations we use one triple can be in any number
of graphs, even nested ones
(SESAME, Virtuoso, OWLIM).
The point Steve is making here that Named Graphs are the only way in
which facts in a database can be
described as explicit content of multiple(!) information objects which
are described (creation etc.) in the
same system. There is no other choice for implementing argumentation
systems which explicitly describe
premises and conclusions as propositions in the database.
On 24/7/2014 11:03 ??, Richard Light wrote:
I must say that I'm not so sure that named graphs are going to be
particularly useful for implementations of the CRM. As I understand
it (and I don't claim to be an RDF expert), the idea of quads was
invented so that "naked" RDF assertions could be given a "context".
The problem I have always had with that idea is that you only get one
shot at it (i.e. you can only assign one context to any given triple).
Surely (a) we need to be able to express multiple contexts for
statements made within the CRM, (b) we have already developed a rich
enough use of RDF to allow us to do so.
Richard
On 24/07/2014 05:57, Simon Spero wrote:
The AAT might work.
I'm not entirely sure that named graphs are propositional objects as
defined in the CRM, but I think the definition is loose enough.
Named graphs are not graphs that are named; they are a tuple of an
IRI (which is a name), and graph (which is the set of propositions).
If the name is a proposition, it is not one in the graph it is
associated with.
If Propositional objects can include parts which are not
propositions then there is no problem- though it would seem more
natural to have information objects only part of which are
propositional.
That would be a bit too big a change this far down the road ; if
named graphs can't fit directly, graphs themselves would; these
could be part of named graphs.
I am not sure if "The encoding structure known as a "named graph" also
falls
under this class, so that each "named graph" is an instance of an E73
Information Object." is the right way to say it.
May be better "information encoded as named
graphs may represent instances of E73 Information object including an
explicit representation of contents".
Since it is an encoding construct, it may represent other things as
well. In a sense,
it is trivial that any RDF File is an information object, but it is
not trivial if a part of the content
of an RDF File represents (,not "is",) an information object in its
own right.
I would rather put that at the end of the scope note as an
implementation note.
On Jul 24, 2014 12:15 AM, "Stephen Stead" <[email protected]
<mailto:[email protected]>> wrote:
Can you think of a named graph that would be sufficiently iconic
to make a
good example?
Rgds
SdS
Stephen Stead
Tel +44 20 8668 3075 <tel:%2B44%2020%208668%203075>
Mob +44 7802 755 013 <tel:%2B44%207802%20755%20013>
E-mail [email protected] <mailto:[email protected]>
LinkedIn Profile http://uk.linkedin.com/in/steads
-----Original Message-----
From: Crm-sig [mailto:[email protected]
<mailto:[email protected]>] On Behalf Of Øyvind Eide
Sent: 23 July 2014 15:12
To: crm-sig
Subject: Re: [Crm-sig] *** ISSUE *** Revision of scope note for E73
Information Object to specifically include named graphs
Dear Steve,
This sounds good to me. Do you think an example of a named graph
should be
added as well?
Best,
Øyvind
On 18. juli 2014, at 08:44, Stephen Stead wrote:
> Dear CRM-SIG
> I would like to suggest the following revision to the scope
note for E73
Information Object. Its intention is to specifically mention
"named graphs"
as being instances of E73 Information Object. As we look at
implementation
of the CRM it is becoming increasingly obvious that "named
graphs" are going
to be a particularly useful tool, it would therefore seem handy
if we
explicitly mentioned that they live in E73!
> Best regards
> SdS
>
>
> Current Scope Note
> E73 Information Object
> Subclass of: E89 Propositional Object
> E90 Symbolic Object
> Superclass of: E29 Design or Procedure
> E31 Document
> E33 Linguistic Object
> E36 Visual Item
>
> Scope note: This class comprises identifiable
immaterial items,
such as a poems, jokes, data sets, images, texts, multimedia
objects,
procedural prescriptions, computer program code, algorithm or
mathematical
formulae, that have an objectively recognizable structure and
are documented
as single units.
>
> An E73 Information Object does not depend on a specific
physical carrier,
which can include human memory, and it can exist on one or more
carriers
simultaneously.
> Instances of E73 Information Object of a linguistic nature
should be
declared as instances of the E33 Linguistic Object subclass.
Instances of
E73 Information Object of a documentary nature should be declared as
instances of the E31 Document subclass. Conceptual items such as
types and
classes are not instances of E73 Information Object, nor are
ideas without a
reproducible expression.
> Examples:
> § image BM000038850.JPG from the Clayton Herbarium in London
§ E. A.
> Poe's "The Raven"
> § the movie "The Seven Samurai" by Akira Kurosawa § the Maxwell
> Equations
> Properties:
>
> Revised Scope Note
>
> E73 Information Object
> Subclass of: E89 Propositional Object
> E90 Symbolic Object
> Superclass of: E29 Design or Procedure
> E31 Document
> E33 Linguistic Object
> E36 Visual Item
>
> Scope note: This class comprises identifiable
immaterial items,
such as a poems, jokes, data sets, images, texts, multimedia
objects,
procedural prescriptions, computer program code, algorithm or
mathematical
formulae, that have an objectively recognizable structure and
are documented
as single units. The encoding structure known as a "named graph"
also falls
under this class, so that each "named graph" is an instance of
an E73
Information Object.
>
> An E73 Information Object does not depend on a specific
physical carrier,
which can include human memory, and it can exist on one or more
carriers
simultaneously.
> Instances of E73 Information Object of a linguistic nature
should be
declared as instances of the E33 Linguistic Object subclass.
Instances of
E73 Information Object of a documentary nature should be declared as
instances of the E31 Document subclass. Conceptual items such as
types and
classes are not instances of E73 Information Object, nor are
ideas without a
reproducible expression.
> Examples:
> § image BM000038850.JPG from the Clayton Herbarium in London
§ E. A.
> Poe's "The Raven"
> § the movie "The Seven Samurai" by Akira Kurosawa § the Maxwell
> Equations
> Properties:
>
>
> Stephen Stead
> Director
> Paveprime Ltd
> 35 Downs Court Rd
> Purley, Surrey
> UK, CR8 1BF
> Tel +44 20 8668 3075
> Fax +44 20 8763 1739
> Mob +44 7802 755 013
> E-mail [email protected] <mailto:[email protected]>
> LinkedIn Profile http://uk.linkedin.com/in/steads
>
> _______________________________________________
> Crm-sig mailing list
> [email protected] <mailto:[email protected]>
> http://lists.ics.forth.gr/mailman/listinfo/crm-sig
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| Email:[email protected] |
|
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