Re: LDP interfaces in Java (based on Jena and JAX-RS)

@reza

"Whatever the standard is at the end, am I assuming correctly that it'll
have no mention of Jena, Sesame (reference to OpenRDF), etc.
implementation specific architectures, right?"

agreed, also in general...

creating a standard should lean towards kant's categorical imperative
[1] :-)

"Act only according to that maxim whereby you can, at the same time,
will that it should become a universal law."

wkr turnguard

[1] http://en.wikipedia.org/wiki/Categorical_imperative

On Mon, 2012-08-06 at 13:47 -0700, Reza B'Far (Oracle) wrote:
> Folks -
> 
> I have to say I'm lost in the intent of the thread.  Why are specific
> technologies (Jena, Servlets, etc.) or implementation architectures
> that have been described relevant to standardization effort and
> charter of group?  I'm sure I'm missing something since I'm new to the
> WG, but perhaps someone can shed some light on that.
> 
> Whatever the standard is at the end, am I assuming correctly that
> it'll have no mention of Jena, Sesame (reference to OpenRDF), etc.
> implementation specific architectures, right?
> 
> Best
> 
> On 8/6/12 1:34 PM, Martynas Jusevičius wrote:
> 
> > Jürgen,
> > 
> > my interfaces and application are meant for server-side Java, and
> > your's is more of an AJAX application, as far as I understand?
> > Graphity can manage RDF and also serve Linked Data, either as a
> > platform or via user interface. Here's the default one:
> > http://semanticreports.com/?uri=http%3A%2F%2Fwww.turnguard.com%2Fturnguard.rdf
> > 
> > In regard to this discussion my thread started (I can't get mail from
> > public-ldp-wg) I think the most important one is the one Andy is
> > making (I think): only RDF-based LDP would allow generic web
> > applications, because there would be no data model conversions in the
> > entire dataflow between the client and the server (vocabulary
> > conversions might be still needed, but XML or JSON has that problem
> > too).
> > This seems to me as an important goal. Not underlining RDF would keep
> > us attached to the Web 2.0 approach.
> > 
> > Martynas
> > graphity.org
> > 
> > On Mon, Aug 6, 2012 at 11:03 PM, Jürgen Jakobitsch
> > <j.jakobitsch@semantic-web.at> wrote:
> > > hi,
> > > 
> > > that is interesting, because it looks somehow complicated..
> > > 
> > > i'm working on a a single servlet, that does all the ldp stuff.
> > > you can see it in action here [1].
> > > 
> > > i more or less have only one interface, one that has a method
> > > to return a openrdf sesame repository connection. every request
> > > is supplied with that connection via request.setAttribute.
> > > 
> > > now with that connection it is just a matter of doing content
> > > negotiation (which is real easy with sesame, i get an appropriate writer
> > > for every serialization format) and running queries.
> > > with my openrdf-jsp-writer i have a whole template engine.
> > > 
> > > with this technique i am currently writing a skos:thesaurus management
> > > tool with ease. one very simple webapp can be seen here [2]. if you
> > > trace through the sourcecode of the page, you'll realize that i'm went
> > > away from programming huge apis with controllers, services, spring,
> > > struts and all that.
> > > the page is simply based on events that trigger sparql queries, the
> > > results of which are displayed using jsp templates.
> > > do i need more, eh .. nope...
> > > 
> > > please note that i'm especially writing such apps that organize data
> > > into projects (like a skos thesaurus or sioc spaces) because i think
> > > such things are a little underrepresented (contrary to huge datasets).
> > > 
> > > wkr turnguard
> > > 
> > > [1] http://www.turnguard.com/turnguard
> > > [2] http://business.turnguard.com/html/
> > > 
> > > On Sun, 2012-08-05 at 18:05 +0300, Martynas Jusevičius wrote:
> > > > Hey all,
> > > > 
> > > > I think it would be fair to say that Linked Data is a juxtaposition of
> > > > RDF and REST, and therefore a Linked Data platform has to implement
> > > > specifications from both worlds.
> > > > 
> > > > I have been hacking a prototype LDP for a while now, and have
> > > > distilled generic interfaces that describe it. With this I mean not
> > > > some abstract specification, but concrete Java interfaces combining
> > > > and reusing interfaces from Jena and JAX-RS, which are main Java
> > > > frameworks for RDF and REST, respectively. Here's the base one:
> > > > 
> > > > @Consumes({MediaType.APPLICATION_RDF_XML + "; charset=UTF-8",
> > > > MediaType.TEXT_TURTLE + "; charset=UTF-8"})
> > > > @Produces({MediaType.APPLICATION_RDF_XML + "; charset=UTF-8",
> > > > MediaType.TEXT_TURTLE + "; charset=UTF-8"})
> > > > public interface Resource extends LinkedDataResource
> > > > {
> > > >     @GET Response getResponse();
> > > > 
> > > >     @POST Response post(Model model);
> > > > 
> > > >     @PUT Response put(Model model);
> > > > 
> > > >     @DELETE Response delete();
> > > > 
> > > >     EntityTag getEntityTag();
> > > > 
> > > > }
> > > > 
> > > > Source: https://github.com/Graphity/graphity-browser/blob/master/src/main/java/org/graphity/ldp/model/Resource.java
> > > > 
> > > > This might or might not be useful when defining an abstract
> > > > specification, but I already have multiple web applications
> > > > successfully implementing this.
> > > > Feedback is very welcome.
> > > > 
> > > > Martynas
> > > > graphity.org
> > > > 
> > > --
> > > | Jürgen Jakobitsch,
> > > | Software Developer
> > > | Semantic Web Company GmbH
> > > | Mariahilfer Straße 70 / Neubaugasse 1, Top 8
> > > | A - 1070 Wien, Austria
> > > | Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22
> > > 
> > > COMPANY INFORMATION
> > > | web       : http://www.semantic-web.at/
> > > | foaf      : http://company.semantic-web.at/person/juergen_jakobitsch
> > > PERSONAL INFORMATION
> > > | web       : http://www.turnguard.com
> > > | foaf      : http://www.turnguard.com/turnguard
> > > | g+        : https://plus.google.com/111233759991616358206/posts
> > > | skype     : jakobitsch-punkt
> > > | xmlns:tg  = "http://www.turnguard.com/turnguard#"
> 

-- 
| Jürgen Jakobitsch, 
| Software Developer
| Semantic Web Company GmbH
| Mariahilfer Straße 70 / Neubaugasse 1, Top 8
| A - 1070 Wien, Austria
| Mob +43 676 62 12 710 | Fax +43.1.402 12 35 - 22

COMPANY INFORMATION
| web       : http://www.semantic-web.at/
| foaf      : http://company.semantic-web.at/person/juergen_jakobitsch
PERSONAL INFORMATION
| web       : http://www.turnguard.com
| foaf      : http://www.turnguard.com/turnguard
| g+        : https://plus.google.com/111233759991616358206/posts
| skype     : jakobitsch-punkt
| xmlns:tg  = "http://www.turnguard.com/turnguard#"