So #11 I think is wrong as you don't have to have a
common schema description language, the data model has to be the same but one
can use a different schema description language. So one implementation could
use RDF and another implementation could use something else.
So I don't think the data model has to change if you want to describe the data
model in RDF.
Anthony Nadalin | Work 512.838.0085 | Cell 512.289.4122
"Paul
Trevithick" <paul@xxxxxxxxxxxxxxxxx>
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"Paul
Trevithick" <paul@xxxxxxxxxxxxxxxxx>
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Subject
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[higgins-dev]
Revised Higgins data model goals
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I
am working on yet another data model proposal based on RDF. While I've
been working on it, I've compiled a revised set of
data model goals. Some
are goals that I think we'd all agree on but were
never explicitly stated.
And admittedly some only make sense when viewed
from the lens of RDF. The
new goals are here: http://spwiki.editme.com/RevisedDataModelGoalsM4
A few words about RDF...RDF offers a simple,
proven, rigorous, standardized
framework to describe the *semantics* of data in
any context to enable
interoperability. It allows object classes to be
described in RDF Schema
descriptions (or even more powerful ontology
description languages) instead
of in the core data model itself. Context provider
implementers are free to
choose whatever internal data classes, structures,
relational tables, etc.
that they prefer, as long as they understand the
mapping from it to RDF and
RDF-Schema. My hope is that RDF will allow us to
agree on a simple data
model as a foundation and then move up a level to
work on common
schemas/classes/etc.
-Paul
PS: Here is RDF primer in half a page:
RDF is extremely simple. In the core data model
there are only three
fundamental primitives:
Resources - a thing (identified by a URI)
Properties - Resources have Properties
(identified by a URI)
Values - Properties have values. The values
can be literals or Resources
Data is described in RDF by using a set of
statements (called triples). Each
statement has three parts:
Subject - the resource
Predicate - the property of the resource
Object - the value of the predicate of the
resource
Here are a couple of examples of RDF triples
(liberties taken to prettify
URIs of the resources: Paul, Jim, and B-Movies):
{Paul, eyeColor, "green"}
{Paul, interestedIn, B-Movies}
{Paul, knows, Jim}
{Jim, interestedIn, B-Movies}
Layered over RDF is RDF-Schema that adds the
notion of what in UML would be
called a class.
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