Dear Simon,
On 26/7/2014 12:41 πμ, Simon Spero wrote:
To clarify (or obfuscate),
The term "named graph", as used in RDF, is defined in section 4 of
the RDF 1.1 Concepts and Abstract Syntax Recommendation
<http://www.w3.org/TR/rdf11-concepts/#section-dataset>.
Each named graph is a pair consisting of an IRI
<http://www.w3.org/TR/rdf11-concepts/#dfn-iri> or a blank node
(the graph name), and an RDF graph
<http://www.w3.org/TR/rdf11-concepts/#dfn-rdf-graph>.
[...]
NOTE
Despite the use of the word “name” in “named graph
<http://www.w3.org/TR/rdf11-concepts/#dfn-named-graph>”, thegraph
name <http://www.w3.org/TR/rdf11-concepts/#dfn-graph-name>is not
required todenote
<http://www.w3.org/TR/rdf11-concepts/#dfn-denote>the graph. It is
merely syntactically paired with the graph. RDF does not place any
formal restrictions on whatresource
<http://www.w3.org/TR/rdf11-concepts/#dfn-resource>the graph name
may denote, nor on the relationship between that resource and the
graph. A discussion of different RDF dataset semantics can be
found in [RDF11-DATASETS
<http://www.w3.org/TR/rdf11-concepts/#bib-RDF11-DATASETS>].
That's clear enough :-)
I see your point now: The Named Graph is does not give a name to the set
of triples in it, because two identical sets of triples can have
different names. It is a new thing with a name, which contains a set of
triples.
I have no problems with having an entity that made of one part that
is a Propositional Object, and another part that is an IRI. The
obvious identity criteria for such an entity would include both
components - two "named graph"s with different IRI parts would be
distinct.
That is the idea. I'd see the propositions as "content" or "parts" of
the Named Graph. At least implementations using reference counts
for identical triples in diferent Named Graphs regard them as
non-identical, even if they have the same content. That makes them
suitable for us to trace provenance as we would do with information
objects. Information Objects acquire an individual history. With
Named Graphs, I can connect such a history. I could also use the Named
Graph to model a belief - associating with the IRI a belief value, a
validity time-Span and a believing Actor.
Interesting cases are, when different people detect the same laws of
nature or mathematics. We would keep the different traditions as
distinct, and eventually detect the identity, which merges the two
traditions. Otherwise we would mess up reasoning about the information
transfer. Also, we would mess up cases when different senses are
intended with incidentally identical phrases.
So, I'd argue, semantics of Named Graphs that bind identity to the name
plus content are indeed what we need to model information objects
consisting of statements in form of triples.
Best,
Martin
( I also have no problem with the Cyc mereological approach to the
relationship between conceptual works and information bearing objects,
so my judgement is suspect).
Simon
On Fri, Jul 25, 2014 at 1:13 PM, martin <[email protected]
<mailto:[email protected]>> wrote:
Dear Simon,
I am not sure if I understand your argument. Any informartion
object might quite well have a name.
In particular it has an identity as a unit, and being a unit is
not equal to any of its propositions. This is probably
the same as modelling the Named Graphs as tuples (name, set).
I'd however question your statement:
"Named graphs are not graphs that are named; they are a tuple..."
I'd say, they are graphs that are named
in the framework of RDF encoding using a particular syntax. They
can be modelled mathematically as tuples...."
A tuple (name, set) is equally meaningless out of the context to
which such a model refers to. It could be
anything you would like to use it for. That's maths. Isn't it?
In other words, yes, an information object has not only content.
It has a unity, an identity, and even a provenance.
The question is, if two information objects are identical if the
contain the same set of symbols or propositions
but have different provenance. This is particularly a problem with
very small information objects.
Best,
Martin
On 24/7/2014 7:57 πμ, 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.
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 <tel:%2B44%2020%208668%203075>
> Fax +44 20 8763 1739 <tel:%2B44%2020%208763%201739>
> 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
>
> _______________________________________________
> Crm-sig mailing list
> [email protected] <mailto:[email protected]>
> http://lists.ics.forth.gr/mailman/listinfo/crm-sig
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<tel:%2B30%282810%29391638> |
| Email:[email protected]
<mailto:[email protected]> |
|
Center for Cultural Informatics |
Information Systems Laboratory |
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Foundation for Research and Technology - Hellas (FORTH) |
|
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--
--------------------------------------------------------------
Dr. Martin Doerr | Vox:+30(2810)391625 |
Research Director | Fax:+30(2810)391638 |
| Email: [email protected] |
|
Center for Cultural Informatics |
Information Systems Laboratory |
Institute of Computer Science |
Foundation for Research and Technology - Hellas (FORTH) |
|
N.Plastira 100, Vassilika Vouton, |
GR70013 Heraklion,Crete,Greece |
|
Web-site: http://www.ics.forth.gr/isl |
--------------------------------------------------------------
