On 19/3/18, 9:59 pm, "Laura Morales" <[email protected]> wrote:
>TBH I think you're writing to the wrong mailing list. You should write to
the <insert UI framework here> mailing list, and ask them to provide example
code to use the UI with a Fuseki >backend instead of MySQL.
The UI people would, quite rightly, point to any number of examples of people
using SQL or other custom means of getting information into their components.
Then they would tell me to go to the mailing list for the exotic framework I'm
interested on promoting and ask the users to contribute some example code.
Which is what I have done.
The answer seems to be that there isn't any. I can live with that. If I find
the time I'll write some.
Then the people in this group can laugh at my efforts and write better examples!
DM
Sent: Monday, March 19, 2018 at 12:33 PM
From: "David Moss" <[email protected]>
To: [email protected]
Subject: Re: Example code
On 19/3/18, 5:39 pm, "Lorenz Buehmann"
<[email protected]> wrote:
>Well, isn't that the task of the UI logic? You get JSON-LD and now you
>can visualize it. I don't really see the problem here?
Therein lies the problem. I'm sure _you_ know how to do it.
How does someone without experience in integrating Jena with UI know how to
do it?
>dataset -> query -> data -> visualization (table, graph, etc.)
Those are indeed a set of steps. Do you have an example of how to do that
in java code and load the result into a combobox for selection in a UI?
>Why should this be an example on the Apache Jena documentation?
It shouldn't. It should be stored separately from the Apache Jena
documentation.
The Javadoc is for how Jena works internally and how to maintain Jena
itself.
I'm talking about examples to help people use Jena in the kind of
applications people want to use.
One of the dilemmas I have regarding Jena is how to store query results
locally.
I could use Jena to query an endpoint, iterate through the ResultSet and
build POJOs or Tables.
Or is it better to keep the results in a Model and query that again to
build UI components?
Or maybe I should ditch the fancy Jena objects and just get a result as a
JSON object and work with that?
These are all possibilities, but how is it actually being done in real
projects? Where are the examples?
A reply like "dataset -> query -> data -> visualization (table, graph,
etc.)" is very glib, but it doesn't actually have anything in the way of
example code that can be used by people new to Jena in their own real-world
programs. That is what I see as missing.
DM
On 19.03.2018 08:31, David Moss wrote:
> That is certainly a way to get data from a SPARQL endpoint to display in
a terminal window.
> It does not store it locally or put it into a user-friendly GUI control
however.
> Looks like I might have to roll my own and face the music publicly if I'm
doing it wrong.
>
> I think real-world examples of how to use Jena in a user friendly program
are essential to advancing the semantic web.
> Thanks for considering my question.
>
> DM
>
> On 19/3/18, 4:19 pm, "Laura Morales" <[email protected]> wrote:
>
> As far as I know the only way to query a Jena remotely is via HTTP. So,
install Fuseki and then send a traditional HTTP GET/POST request to it with two
parameters, "query" and "format". For example
>
> $ curl --data "format=json&query=..." http://your-endpoint.org
>
>
>
> Sent: Sunday, March 18, 2018 at 11:26 PM
> From: "David Moss" <[email protected]>
> To: [email protected]
> Subject: Re: Example code
>
> On 18/3/18, 6:24 pm, "Laura Morales" <[email protected]> wrote:
>
> >> For example, when using data from a SPARQL endpoint, what is the
accepted
> >> way to retrieve it, store it locally and make it available through user
> >> interface controls?
>
> >Make a query that returns a jsonld document.
>
> How? Do you have some example code showing how this query is retrieved,
dealt with locally and made available to an end user through a GUI control?
> What I am looking for here is a bridge between what experts glean from
reading Javadoc and what ordinary people need to use Jena within a GUI based
application.
>
> I see this kind of example as the missing link that prevents anyone other
than expert using Jena.
> So long as easy to follow examples of how to get from an rdf triplestore
to information displayed on a screen in a standard GUI way are missing, Jena
will remain a plaything for expert enthusiasts.
>
> DM
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