Howdy

I was able to use Jena within my Win2K environment without any problem, but
am getting segmentation violations when using ModelMem.read(uri) on my
FreeBSD system. I'm using the linux-jdk1.2.2 FreeBSD port. I was able to get
Sample5 working -- as a test of environment -- but not reading a file into
memory.

Do you have any systems requirements for working with Jena anywhere? Basic
JDK, that sort of thing?

Thanks!

Shelley

--------------------------------------------------
Shelley Powers     shelleyp@...

Burning Bird Network: http://www.burningbird.net

From: Dave Reynolds [mailto:der@...]
> > Not yet :(
>
> Actually that's not quite right I don't think. Isn't the
> subClassOf/subPropertyOf closure supported by the DAML API? Ian?
>
> Dave

Yes, if you create a DAML model, rather than a standard Jena model, you can
generate the triples implied by the sub-class, sub-property and
daml:equivalentTo relationships. However, it's all a bit empirical, and one
thing I haven't done is check my code against Pat's model theory.  I also
haven't worked formally with the DAML model theory, in part because the
"inferencing" I do is very weak.  In particular, it doesn't understand DAML
restrictions, which is one of the more interesting/powerful parts of the
DAML spec.

As to David Allsop's original question about RDFS: I haven't tried loading
an RDFS document, rather than a DAML document, into a DAML model.  Off the
top of my head, it probably ought to work. But it hasn't been tested, and I
probably ought to add a test case to the DAML unit test to cover RDFS.  Two
more tasks for the ToDo list then :-)

Cheers,
Ian

David Allsopp wrote:

> Hi all,
>
> A quick question; does Jena have any specific support for RDF schema?


Not yet :(


>
> For example, in the Stanford RDF API you can create an RDFSchemaModel
> which stores the transitive closure of subClassOf and subPropertyOf.
> Querying the schema model therefore gives you access to the
> implicit information that can be inferred from the schema.


Yup, I understand.  Inference is something we'd like to get to soon.  What kinds
we will do hasn't yet been decided.  I did play around with a prolog based model
implementation as an experiment, but that's been in disuse for a while.

I'll add this to the list of enhancement requests.  My personal take is that it
should be high on the list.

Brian

Hi all,

A quick question; does Jena have any specific support for RDF schema?

For example, in the Stanford RDF API you can create an RDFSchemaModel
which stores the transitive closure of subClassOf and subPropertyOf.
Querying the schema model therefore gives you access to the
implicit information that can be inferred from the schema.

The RDF API doesn't do a complete closure (e.g. as described in Pat
Hayes new model theory) but is useful nonetheless...

Regards,

David Allsopp
QinetiQ
UK

Hi Charlie,
The problem we're facing with the semantic web - i.e. making resources on
the web more amenable to automated processing by computational processes
like agents - is that HTML is basically a presentation language.  HTML is
optimised for producing interesting web pages for human readers, rather than
presenting data, or wrapping other active web services. XML is part of the
response to that problem, by regularising the syntax and making it more
extensible. But XML is only syntax: XML documents have no intrinsic meaning
- it's up to the processor what the XML elements mean.  RDF goes a step
beyond XML by introducing some basic semantic constructs: RDF triples are
positive ground assertions, and so have a certain amount of representational
power.  DAML builds on RDF by adding more representational power, using a
description logic as its semantic basis.  DAML isn't as powerful as
first-order logic, but is more computationally tractable.  In essence, DAML
lets you build a description of the classes of things in your domain of
discourse, and their properties and interrelationships.

Now, does DAML help you make sense of an arbitrary web page? No, it has
nothing to help you do that. But RDF, and hence DAML, are written so that
semantic markup can be added to a web-page, such that it won't damage the
presentation of the page by a conformant HTML renderer.  So you can have a
web page that is both readable by humans, *and* is more amenable to reliable
automated processing.  You can, of course, use RDF/DAML as a stand-alone
knowledge representation or data-encoding formalism.  In fact, this is
probably the more common use.

Hope that helps.  There's a load more information on DAML at:
	 http://www.daml.org

Cheers,
Ian

> -----Original Message-----
> From: Charlie Abela [mailto:abcharl@...]
> Sent: 09 October 2001 20:59
> To: jena-dev@yahoogroups.com
> Subject: [jena-dev] New to DAML
>
>
> Hi everyone.
>
> I am an BSc.IT undergraduate student at the University of Malta
> (Europe). I am increasing my interest in DAML due to the final
> project in connection with the degree.
> DAML is supposed to make it more easier for web agents to understand
> the semantics of a web page..right?
> This concept is still not clear enough...can somebody elaborate a bit?
>
> Thanks to anyone who replies
>
> Charlie

Hi everyone.

I am an BSc.IT undergraduate student at the University of Malta
(Europe). I am increasing my interest in DAML due to the final
project in connection with the degree.
DAML is supposed to make it more easier for web agents to understand
the semantics of a web page..right?
This concept is still not clear enough...can somebody elaborate a bit?

Thanks to anyone who replies

Charlie

> Hi Inkel
Hi Andrei

> It would be very interesting to see the  architecture of the system
> How would like to store the data about channels and news, how to
retrive
> data?
> Andrei
That was a very good question :)

Right now, I'm between 2 ideas: one is to retrieve and store the RDF
file in a directory (like M$ Explorer cache), or store the
information in a database. I'm reading about Jena and RDQL
(http://www.hpl.hp.com/semweb/), I think they offer a nice backend to
store the data, but I'm just reading right now.

Regards

inkel

Hi Inkel

It would be very interesting to see the  architecture of the system
How would like to store the data about channels and news, how to retrive
data?
Andrei

----- Original Message -----
From: <inkelar@...>
To: <jena-dev@yahoogroups.com>
Sent: Tuesday, October 09, 2001 6:34 PM
Subject: [jena-dev] Re: Greetings


> > Hi Inkel,
> Hi Brian
>
> > Welcome.  Would you care to say some more about your application of
> RDF/RSS
> > for syndication?
>
> Ok. Well, my idea is to have a site you gives you the possibility to
> grab news from sites who syndicate their contents using RDF or RSS.
> Next, you could select to view this news at the site or receive them
> in your mail.
>
> I know that my idea already exists (http://www.moreover.com/,
> http://blogger.com/, http://newsisfree.com/), but I want to do it,
> first, for myself, next, because I don't know of any site doing this
> here at Argentina, or in Spanish.
>
> The project it's based in JSP, JDBC, and, off course, RDF
> Syndication. You could find more information about RDF at
> http://blogspace.com/rss/
>
> I'll be posting announces every month I hope.
>
> Regards
>
> inkel
>
>
> To unsubscribe from this group, send an email to:
> jena-dev-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

> Hi Inkel,
Hi Brian

> Welcome.  Would you care to say some more about your application of
RDF/RSS
> for syndication?

Ok. Well, my idea is to have a site you gives you the possibility to
grab news from sites who syndicate their contents using RDF or RSS.
Next, you could select to view this news at the site or receive them
in your mail.

I know that my idea already exists (http://www.moreover.com/,
http://blogger.com/, http://newsisfree.com/), but I want to do it,
first, for myself, next, because I don't know of any site doing this
here at Argentina, or in Spanish.

The project it's based in JSP, JDBC, and, off course, RDF
Syndication. You could find more information about RDF at
http://blogspace.com/rss/

I'll be posting announces every month I hope.

Regards

inkel

Hi Inkel,


inkelar@... wrote:

> Hi everyboy. I'm now to the list, and also I'm not an expert
> programmer, but I'm a good one :)


I'm not an expert either;  I don't even consider myself a good one.

>
> I'm glad to be subscribed to this list, 'cause I'm very interested
> about Java & XML, particularly in RDF / RSS / Web Syndication.


Welcome.  Would you care to say some more about your application of RDF/RSS
for syndication?

Brian

Hi everyboy. I'm now to the list, and also I'm not an expert
programmer, but I'm a good one :)

I'm glad to be subscribed to this list, 'cause I'm very interested
about Java & XML, particularly in RDF / RSS / Web Syndication.

I'm from Argentina, soy I ask you to excuse my english.

Well, that's all right now. Regards,

inkel

Dear Brian,
thank you for your response.
> Looks like we have a lot of interests in common.  Would you care to say
more
> about what you are using RDF for?
There are several objectives of RDF usage in my work.
Now we are (Vienna University of Technology) developing CRIS (Current
Research Information System), which will provide access  to research data
from different universities, institutions in Austria. And in the next stage
we would like to work with different research bodies in Europe. The research
data from different organizations and especially countries are described in
different structures, sometine has different meaning, and different
vocabularies used. To provide user unified access to data, the data should
be described semantically. There are conventional KM technologies and
Semantic Web. I choosed Semantic Web (format, XML N3 encoding, query
facilities, inference facilities) as a technology to implement solution, due
to RDF technologies is powerfull enaugh and easy to implement/publish data
by other bodies. Of course, webalization of KM is very important for CRIS
when it is impossible require following to one ontology, exact meaning,
logic validity and soundness in all cases for all organizations.  So the
first I am trying to use Semantic Web as a technology to develop KM solution
for science

The second. Knowledge Markup of research data in RDF can be make process of
data collecting and consolidation much more easy then conventional RDBMS
replication, XML data exchange, any API technologies.
Please, Lopatenko A., "Information retrieval in Current Research Information
Systems", position paper at the Workshop on Knowledge Markup and Semantic
Annotation at K-CAP'2001, Oct. 21-23, 2001

The third. Just data exhange netween institutions. RDF and DAML + OIL
descriptions of classes and properties semantics makes data much more
resuble and appliable in different conditions.


>
>     model.write(writer, "RDF/XML-ABBREV");
Thank. I'll try
Best regards
MSc Andrei S. Lopatenko
Researcher
Vienna University of Technology
Extension Centre
http://derpi.tuwien.ac.at/~andrei/
>
> Note there is a documentation error in the javadoc, the language string
above is
>   correct.
>
> I hope this helps.
>
> Brian
>
>
>
> To unsubscribe from this group, send an email to:
> jena-dev-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

Hi Andrei,

Andrei S. Lopatenko wrote:

> Dear All,
>
> I am new member of this group


As its a pretty new group, we al are :)  You are pretty close to being a founder
member.

> and at first little information about me
>
> I am Andrei Lopatenko, researcher at Vienna University of Technology.
>
> Primary area of interests:
>
>     Current Research Information System, integration of heterogeneous
> data sources, semantic and structural interoperability, knowledge
> markup, ontology design, Semantic Web technologies, information retrieval


Looks like we have a lot of interests in common.  Would you care to say more
about what you are using RDF for?


>
>
>
> I have very simple question, but unfortunately I did not found answer in
> Jena documentation (read sources is too long )


Improving the documentation is something that's on the todo list, and has been
for too long :(  You could try using the pretty writer:

     model.write(writer, "RDF/XML-ABBREV");

Note there is a documentation error in the javadoc, the language string above is
   correct.

I hope this helps.

Brian

>Bit warm at the moment;  I'm in Nice struggling to get internet
>connectivity
>working.

Nice eh? That's errm... good. What you doing there?
The connectivity thing is a pain - seems like there's this wonderful
infrastructure everywhere, until you get there and try to connect...

>That sounds very attractive.  I was just wondering where to go for
>my hols next
>year :)

Well, if all goes well and we get this house (still a bit touch and go) then
you'll be more than welcome to stay over.

>Personally, I've hacking together a little bit of code to help
>with the more
>mundane tasks of chairing the WG - tracking actions, issues,
>generating agendas,
>minutes that sort of thing.  It's all very crude - it's at the
>stage where it
>probably needs more time to run it this way than doing things by
>hand, but its
>getting there.

A worthwhile task - despite the obvious amount of work that goes into it, it
still seems difficult to get a clear idea what is happening.

>Apart from that and the BDB store, not much.

Sounds plenty!

>Its good to hear from you again.

and you,
Danny.

Danny Ayers wrote:

> Hi Brian, how you doing?


Bit warm at the moment;  I'm in Nice struggling to get internet connectivity
working.


>
>  > It was mostly 'all involved' this time :)
>
> I've not had chance to have a play yet, but I'm looking forward to
> it. I found the previous version of Jena (with your intro docs) like
> a breath of fresh air - intuitive & easy to plug into (still don't
> like the static classes for vocabularies though ;-).


You are very kind.


>
>  > So which hemisphere are are you in at the moment?
>
> We're now up in the Tuscan hills, behind Lucca, in the process of
> selling the house in the uk and buying one here. The plan is to stay
> here indefinitely (ok, I've said that before, but we never went as
> far as buying a house before).


That sounds very attractive.  I was just wondering where to go for my hols next
year :)

[...]


> What's on your agenda - any Jena-based apps in the pipeline?


Personally, I've hacking together a little bit of code to help with the more
mundane tasks of chairing the WG - tracking actions, issues, generating agendas,
minutes that sort of thing.  It's all very crude - it's at the stage where it
probably needs more time to run it this way than doing things by hand, but its
getting there.

Apart from that and the BDB store, not much.

Its good to hear from you again.

Brian

Hi Seth,

I for one am interested in your idea - this is a SemBrowser, right?
The details you are giving here are grand (as they say in Yorkshire). Even
if the idea you have isn't realised as you describe, having what are
effectively use cases takes things a long way along the development process
for anyone looking in this area. Write up the app, post it on the web, drop
a mail in the appropriate lists (but remember to include a liense notice, in
case Bill G. wants your babies). Better still, write up as much as you can
and post it at sourceforge, mail all the ace student coders looking for
projects and then project manage.

[pruned]

>>   The problem I have with Protégé**, OILedit, and even tools like
>> Jade, FIPA-OS, etc, is that you have to buy in to their whole approach.

Hmm - though my emotional response is pure agreement, I'm not sure
realistically how true this is, e.g. Protege, you write your own plug-in and
have the advantage of eveything that's there already.

Personally I'd like to see Jena continue having the same feel as Batik (I've
only just started playing with Batik, and have found that this too is
nice) - you have your own little app setup, then need to add something to it
(I want to export in yea format) and one or two lines of code is all that is
needed.

>I agree.  Jena is a great toolkit and i would use it as such if my
>programming days were not over.

Optimist.

> Thing is that the GUI application I scoped
>above should also be able to be easily extended by any programmer type ....
>just write a script in Jena and a assign it to a button or a menu item.

Eeek - you're in danger of giving away your background there - let me
rephrase that for you :

write a script in *Python* then call the appropriate modules...

Cheers,
Danny.

> So, since you asked, here goes ...
[snip]
> I have much more detail all written in my mind ... but i'll stop here
> to see
> if anyone is interested.

Does sound interesting. A little while ago I was toying with the idea of
an "RDF console" or "RDF explorer" app for finding your way round RDF
models. Sounds related. I started to look at the literature on
information visualization where there are a few techniques for how to
usefully visualize *big* graphs - which seems to be a challenge that RDF
brings us! Never got as far as cutting code unfortunately.

Dave

From: Dickinson, Ian J

>> Has anyone built a windows GUI for jena ?

>I don't know of one, but Brian may have more info.  However, I'm not sure
>what a general purpose GUI for Jena would look like.

Well of course I'm not talking of jena itself .. which I think is just great
the way it is .... but of an envisioned app that was built upon the jena
toolkit.   Such an app would be user level and not require programming (or
RDF) knowledge at all.  So, since you asked, here goes ...

Basically it has 4 windows  ...

1) Top panel would have pull down menus and buttons and a address bar just
like a web browser ... type the url in the address box and the context is
shown in the browser window.

2) The browser window where content is shown ... it is always shown
according to some transform and style sheet which can be specified by the
user.

3) Left panel is context (model) browser ... similar but different than the
favorits panel of IE.  An Essential feature is that content can be dragged
and dropped into contexts from the address box or the browser window.  And
of course selecting a context folder will cause content to show up in the
browser window.

4) Fourth panel would be input ... where you type RDQL queries .... results
show in content window ... also one could type assertions in some prefered
language ....  input is always parsed into the context selected.

I have much more detail all written in my mind ... but i'll stop here to see
if anyone is interested.

>   The problem I have with Protégé**, OILedit, and even tools like
> Jade, FIPA-OS, etc, is that you have to buy in to their whole approach.

I agree.  Jena is a great toolkit and i would use it as such if my
programming days were not over.  Thing is that the GUI application I scoped
above should also be able to be easily extended by any programmer type ....
just write a script in Jena and a assign it to a button or a menu item.

Seth Russell

Hi Brian, how you doing?

> It was mostly 'all involved' this time :)

I've not had chance to have a play yet, but I'm looking forward to
it. I found the previous version of Jena (with your intro docs) like
a breath of fresh air - intuitive & easy to plug into (still don't
like the static classes for vocabularies though ;-).

> So which hemisphere are are you in at the moment?

We're now up in the Tuscan hills, behind Lucca, in the process of
selling the house in the uk and buying one here. The plan is to stay
here indefinitely (ok, I've said that before, but we never went as
far as buying a house before).

  You writing any code at the
> moment?

I've been having a lot of fun with Swing (see other post), but now
I've got a couple of little contracts to do, one of them involving
SVG generated server-side which I'm quite looking forward to.

What's on your agenda - any Jena-based apps in the pipeline?

Cheers,
Danny.

Dickinson, Ian J wrote:

> Hi Seth,
>  > Has anyone built a windows GUI for jena ?
> I don't know of one, but Brian may have more info.  However, I'm not sure
> what a general purpose GUI for Jena would look like.


It seems like there is a range of useful possibilities here.

I for one would find a really quite primitive editor useful.  I am often hacking
up bits of RDF using emacs in xml mode - getting that wrong led to an
embarrasssing program crash a week or so back.  So an 'assembly level' editor
which simply allowed one to browse around a model showing the resources and
their properties as a tool for creating and mainting models would be really
quite useful.  I think Pierre Richard may have something close to that - it does
browsing - don't know if it does editing.

Libby is, I think, working on a nodes/arc's type GUI for the non-expert user to
make it easy for them to create RDF meta data to be included in their pages.
That seems like a useful tool also.  That seems like a really useful tool for
helping to encourage and promote the use of RDF.

Both of the above are tools that operate on an RDF 'view of the world'.

At the other extreme, I have specialised servletts for editing specific RDF
models that I maintain.  For example, I maintain an action list for the RDFCore
WG in RDF and have a specialised editor for editing that data.  I'm about to do
one for the issue list.  A lot of that code is common.  It would be real nice to
have a tool that could generate this sort of thing automatically.  I'd like an
editor generator, a tool, which given a schema, probably with a bit of extra
annotation, could generate the code for a servlet that would enable editing of
models containing that schema.

Good applications for editing and maintaining RDF models are going to be very
important for getting RDF into the maintstream.  And its end users who will use
them, not just application developers.

Brian

I've been working on a simple GUI interface using Swing - click for
ellipses, rectangles, arcs. A button for export to RDF. I did a hack, where
I got the GUI going more or less, but the way I'd tied in Jena I only got
half-way functional and started to have problems. So I tore it up and
started again, trying to do it 'properly' this time, in particular
separating the GUI, so it could be used with any graph model. I'm currently
maybe 2/3 way through basic functionality, but it's having to take a back
seat for a few weeks while I do some paid work.


Cheers,
Danny.

>-----Original Message-----
>From: Brian McBride [mailto:brian_mcbride@...]
>Sent: 02 October 2001 10:43
>To: jena-dev@yahoogroups.com
>Subject: Re: [jena-dev] Windows gui
>
>
>Hi Seth,
>
>None spefically that I know of.  I've been doing a few apps myself
>recently all
>down through servlet based web interfaces.  I am writing a lot of
>repetitive
>code and it would be nice to have some tool that would enable more rapid
>creation of such apps/interfaces.
>
>I guess you might have something more of a swing editor type gui
>in mind which
>would be real nice.  Might be worth a word with Libby Miller who
>might be doing
>something similar, though I'm not sure what its based on.
>
>Brian
>
>
>Seth Russell wrote:
>
>> Has anyone built a windows GUI for jena ?   I'm looking for a system
>> that has the features of jena but doesn't require a programmer to run
>> ... something more like Protege but with the RDF features of jena.
>>
>>
>>
>> Seth Russell
>>
>>
>> Yahoo! Groups Sponsor
>> ADVERTISEMENT
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>=1705007181:HM/A=795262/R=0/*http://www.ediets.com/start.cfm?code=3257>
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>>
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>> jena-dev-unsubscribe@yahoogroups.com
>>
>>
>>
>> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
>> <http://docs.yahoo.com/info/terms/>.
>
>
>
>
>To unsubscribe from this group, send an email to:
>jena-dev-unsubscribe@yahoogroups.com
>
>
>
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>
>

Hey Danny,

It was mostly 'all involved' this time :)

So which hemisphere are are you in at the moment?  You writing any code at the
moment?

Brian


Danny Ayers wrote:

> Great news!
> Congrats Brian, and all involved.
>
> Cheers,
> Danny.
>
>
>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
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Hi Seth,

None spefically that I know of.  I've been doing a few apps myself recently all
down through servlet based web interfaces.  I am writing a lot of repetitive
code and it would be nice to have some tool that would enable more rapid
creation of such apps/interfaces.

I guess you might have something more of a swing editor type gui in mind which
would be real nice.  Might be worth a word with Libby Miller who might be doing
something similar, though I'm not sure what its based on.

Brian


Seth Russell wrote:

> Has anyone built a windows GUI for jena ?   I'm looking for a system
> that has the features of jena but doesn't require a programmer to run
> ... something more like Protege but with the RDF features of jena.
>
>
>
> Seth Russell
>
>
> Yahoo! Groups Sponsor
> ADVERTISEMENT
> [Click Here!]
>
<http://rd.yahoo.com/M=194081.1637497.3177299.1261774/D=egroupweb/S=1705007181:H\
M/A=795262/R=0/*http://www.ediets.com/start.cfm?code=3257>
>
>
> To unsubscribe from this group, send an email to:
> jena-dev-unsubscribe@yahoogroups.com
>
>
>
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
> <http://docs.yahoo.com/info/terms/>.

Great news!
Congrats Brian, and all involved.

Cheers,
Danny.

Hi Seth,
> Has anyone built a windows GUI for jena ?
I don't know of one, but Brian may have more info.  However, I'm not sure
what a general purpose GUI for Jena would look like.  Our vision is more one
of a constellation of different tools, all related by a common platform, but
which don't force the user (i.e. programmer) to adapt their problem to fit
the tool.  The problem I have with Protégé**, OILedit, and even tools like
Jade, FIPA-OS, etc, is that you have to buy in to their whole approach.
Protégé has a whole pile of plug-ins for different capabilities, but they're
tools that plug _in_ to Protégé, not vice-versa.  My take is that ultimately
we want to build compelling solutions for end-users and customers, and they
by-and-large don't care about RDF, DAML, SQL or query engines - so long as
*their* application does what *they* want.

That said, there certainly are useful tools that might be used to develop,
edit, maintain and visualise RDF graphs and DAML ontologies, etc, i.e. tools
to assist the end-user application developers. I would certainly expect more
and more of these to develop over time.   Some will come from the Jena team,
others from elsewhere.

Did you have a specific need or application in mind?

Cheers,
Ian

** Which is not to say that Protégé isn't a good tool - it is - I just have
a general preference for open solutions.


-----Original Message-----
From: Seth Russell [mailto:seth@...]
Sent: 01 October 2001 22:53
To: jena-dev
Subject: [jena-dev] Windows gui


Has anyone built a windows GUI for jena ?   I'm looking for a system that
has the features of jena but doesn't require a programmer to run ...
something more like Protege but with the RDF features of jena.

Seth Russell

Jena RDF API and toolkit - release 1.2
                    http://www.hpl.hp.com/semweb

Jena is a java API for manipulating RDF models. Its features include:

   o statement centric methods for manipulating an RDF model as a set of
     RDF triples
   o resource centric methods for manipulating an RDF model as a set of
     resources with properties
   o cascading method calls for more convenient programming
   o built in support for RDF containers - bag, alt and seq
   o integrated parsers (ARP and David Megginson's RDFFilter)

This latest release of the jena toolkit integrates a number of new
components:

   o new ARP parser compliant with latest working group recommendations
   o integrated query language (RDQL)
   o support for storing DAML ontologies in a model
   o persistent storage module based on Berkeley DB
   o open architecture supporting other storage implementations

The current release, 1.2.0, is a preview release. We hope it as stable
and functional as jena always has been and should be backward
compatible with previous releases. In the next release we would like
to make various changes, such as cleaning up some features of the API
and shortening the package names, which will require changes to
existing code. Ideally we'd like to make all such changes in one go to
minimise the number of times people have to tweak their client code.
Hence we are putting out this preview release now. Any suggestions you
have for changes to the API - now is a good time to make them! Send
them to the discussion list at: http://groups.yahoo.com/group/jena-dev

The Jena team ...
    Andy Seaborne  (RDQL query support)
    Brian McBride  (core API and Berkeley DB support)
    Dave Reynolds  (web hacker and SQL support (coming soon))
    Ian Dickinson  (DAML API)
    Jeremy Carroll (ARP)

Hi Seth,

Seth Russell wrote:

> Can the same statement be placed in multiple models?


Yes.  A statement with the same subject, predicate and object can be placed in
two models.  Depending on the implementation, this may result in two different
java objects, so be careful to use .equals(...) not == when comparing
statements.


>
> How do you place a statement from one model into another model?
>


    Statement s = m1.createStatement(subject, predicate, object);
    m1.add(s);
    m2.add(s);

or

    m1.add(subject, predicate, object);
    m2.add(subject, predicate, object);

or

    Statement s = m1.getResource("http://foo")
                    .getProperty(RDF.type);
    m2.add(s);

or

    StmtIterator iter = m1.listStatements();
    while (iter.hasNext()) {
        m2.add(iter.next());
}

etc

Does that help?

Brian


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