W3C home > Mailing lists > Public > www-rdf-interest@w3.org > August 2000

Re: Java API

From: Jan Grant <Jan.Grant@bristol.ac.uk>
Date: Mon, 7 Aug 2000 17:31:30 +0100 (BST)
To: "McBride, Brian" <bwm@hplb.hpl.hp.com>
cc: "RDF Interest (E-mail)" <www-rdf-interest@w3.org>
Message-ID: <Pine.GHP.4.21.0008071718370.5537-100000@mail.ilrt.bris.ac.uk>
On Fri, 4 Aug 2000, McBride, Brian wrote:

> I am in the process of building an implementation of these enhancements
> which I intend to make freely available.    I have got far enough with the
> design that I am reasonably confident that it is implementable.   I would
> like to get early feedback before getting too far into the implementation.
> In particular I'd welcome comments on:
> *	is the overall style appealing?

From the examples, yes; if only Java supported operator overloading and
coercion operators, eh? :-)

> *	whilst maintaining the current statement centric method calls, added
> a set of resource centric method calls which are cascadable to make code
> easier to read and write

The improved readability is good; but I'm a bit unsure about this: do
resources carry with them a pointer to the model they're associated
with? (Example below)

> *	explicit container support

This is a really, really good idea.

> *	typed data values in literals - supports built in types and user
> defined objects

The ability to store class definitions (for example) in an RDF model is

> *	explicit support for reification (... dare I mention this :)

Again, there needs to be some support for this. Reification should be
easy to use, because it gives you a handle on doing all sorts of RDF
value-adds (storing provenance information is the example most often
touted around here)

> *	a style more consistent with current java api practice  

The only thing I'm really unclear on thus far is this:

     Resource ora = model.createResource()
                         .addProperty(Dc.name, "Ora Lassila");
     model2.add(ora, Dc.creator, model2.createLiteral("Mr. Lassila, Snr.");
     model2.add(ora, Dc.creator, model2.createLiteral("Mrs. Lassila");

     ora.addProperty(anotherProptery, anotherValue);

Which model is changed by the last call? Does ora have a default
model? Or does it carry an identity with respect to each model it comes
into contact with?


jan grant, ILRT, University of Bristol. http://www.ilrt.bris.ac.uk/
Tel +44(0)117 9287163 Fax +44 (0)117 9287112 RFC822 jan.grant@bris.ac.uk
Generalisation is never appropriate.
Received on Monday, 7 August 2000 12:31:43 UTC

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