Hi Luca,
the spin:constraints (arguments) are not just strings even though the UI
of TBC makes them appear like strings. They are in fact blank nodes that
carry additional triples such as spl:valueType. I suggest to take an
existing function as a blueprint and recreate the bnode object that is
used there.
HTH
Holger
On 25/03/2016 3:21, Luca Greco wrote:
Hi all,
I have some troubles in specifying arguments for a SPIN function I'm
defining through the API.
Let's say this is the definition (code fragment):
spinQuery = (Ask)( arq2SPIN.createQuery(arqQuery1, queryUri));
Function fun = union.createResource(uri,
SPIN.Function).as(Function.class);
fun.addProperty(SPIN.body, spinQuery);
SPINModuleRegistry.get().register(fun, null, true);
in my case, spinQuery contains " ASK WHERE {... }"
I have to specify 2 arguments for the function.
I've tried the following solution:
fun.addProperty(SPIN.constraint, "arg:spThing : rdfs:Resource");
fun.addProperty(SPIN.constraint, "arg:area : rdfs:Resource");
It doesn't work.
Am I doing something wrong?
Many thanks in advance
Luca
Il giorno domenica 20 luglio 2014 03:14:59 UTC+2, Holger Knublauch ha
scritto:
Hi Monika,
the SPIN API is designed to be driven in the same way that SPIN
files are driven - by declarations in RDF. In other words, the
proper way of defining SPIN functions is to edit them with an RDF
editor (such as TopBraid or a text editor) and then simply load
the function definitions into the module registry. This is shown
in the KennedysInferencingAndConstraintsExample via
// Register locally defined functions
SPINModuleRegistry.get().registerAll(ontModel, null);
then just use them in your SPARQL/SPIN queries. In the SPIN RDF
syntax - if you ever want to generate that programmatically, use
the Jena API to create the corresponding triples - a SPIN function
call is simply an instance of the function class.
You may want to clarify which parts of your application are
statically edited and which ones are dynamically produced for
further advise.
Holger
On 7/20/2014 5:16, Monika Solanki wrote:
I am fairly new to SPIN and the SPIN API. I am looking for
examples that show how to create a user defined function using
the SPIN API and use it within a query that runs over a model. I
am mostly aware of how I could develop the second part, but I
would like help on programmatically creating the user defined
function.
Many Thanks,
Monika
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