Hi Holger, Are there any tutorials for using the Javascript query in TBC?
I couldn't understand how to start my test script on that interface.
In my case study, I need to:
- read the instances of ex: coordinates (a list of geographical coordinates)
- Browse the list and, for each member of the list, do:
a) check if it is of the data type xsd:decimal
b) accumulate 1 in the element counter
a) is a restriction of the members of the list
b) it is an instance constraint and must be compared against ex:minOccur in
my shape (e.g.: it must have at least 2 geographic coordinates).
An attempt to start the code was:
propertyName = TermFactory.namedNode("
http://www.example.org/ns#coordinates";);
propertyObject = $data.find($this, propertyName, null) ;
for (t = propertyObject.next(); t; t = propertyObject.next()) {
coordTriple = propertyObject.next();
if (!coordTriple) {
return null;
}
coordinate = coordTriple.object;
if (coordinates.length < $minSize ) {
results.push({
value : coordinates
});
}
}
But the Javascript query is not accepting that way (I think it's syntax).
Hugs,
Angelo
Em qua., 19 de fev. de 2020 às 22:35, Holger Knublauch <
[email protected]> escreveu:
> Hi Angelo,
>
> using TBC-FE (Free Edition), SHACL-JS does work. I have tested your
> previous file, fixing the www. in the label of one instance and get this:
>
> I agree debugging JS can be difficult from a Java-based tool that goes
> into the JS Nashorn engine. One way to debug things is to run the JS
> queries separately. The JavaScript Query view in TBC-FE could be used
> potentially:
>
> Basically you could write your JS code there and put them into the .js
> file when you are confident they work.
>
> Other than this, feel free to send a minimal and complete example of where
> you are stuck, here or on the shacl w3c mailing list.
>
> Holger
>
>
> On 20/02/2020 04:29, Angelo Frozza wrote:
>
> Hello,
>
> I am developing a case study and I have 3 files:
> - DataGraph.ttl - data graph
> - ShapeGraph.ttl - shape graph with SHACL-JS
> - Functions.js - functions for SHACL-JS
>
> I'm using the SHACL API by command line, but I'm having trouble debugging
> the shapefile and the JavaScript function (I don't know what's being passed
> to the variables).
>
> Apparently, the function is being accessed, however, it does not find the
> object to which the validation is applied (ex:coordinates).
>
> Using TBCFE I tried to import the shapegraph and datagraph files for a new
> project (the functions.js file is accessed online), but I was unable to
> validate the data graph through the Model -> Refresh and show problems
> (constraints) menu.
>
> Can TBCFE be used with SHAC-JS?
>
> If yes, can someone help me with a step by step?
>
>
> I believe that I may have several errors in the shapefile or in the
> Javascript function. My biggest difficulty is in debugging these codes.
>
> Best regards,
>
> Angelo
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--
-----
Prof. Angelo Augusto Frozza, M.Sc.
[email protected] <[email protected]>
Doutorando PPGCC/UFSC
Professor EBTT
IFC - Instituto Federal Catarinense - Campus Camboriú
http://about.me/tilfrozza
*Sugestões de leitura:*
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<https://paper.li/TilFrozza/1460718203>*
*STARTUP NEWS - http://paper.li/TilFrozza/1392231760
<http://paper.li/TilFrozza/1392231760>*
*A CAVERNA DO MESTRE - http://paper.li/TilFrozza/1392230815
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*RESUMO DA SEMANA - http://paper.li/TilFrozza/1392231274
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Case_1-DataGraph.ttl
Description: Binary data
Case_1-ShapeGraph.ttl
Description: Binary data
function myMinOccur ($this, $minSize) {
// Defines an array for the return
var results = [];
// Defines the target node's IRI
var propertyName = TermFactory.namedNode("http://www.example.org/ns#coordinates";);
// Finds the object defined by the target node
var propertyObject = $data.find($this, propertyName, null) ;
// Navigate the target node graph
for (var t = propertyObject.next(); t; t = propertyObject.next()) {
var coordTriple = propertyObject.next();
if (!coordTriple) {
return $this.value ;//null;
}
// Each instance is a Javascript object
var coordinate = coordTriple.object;
// We are interested in array objects,
// with array lenght < $minSize
if (coordinates.length < $minSize ) {
results.push({
value : coordinates
});
}
}
return results;
}
