Hi Angelo,
apologies but this type of very detailed question goes beyond what we
can afford to answer for TBC-FE and API users. I hope you understand the
commercial pressures.
Having said this I believe a problem is the !== comparison in
var nil =
TermFactory.namedNode("http://www.w3.org/1999/02/22-rdf-syntax-ns#nil";);
...
for ( ; node !== nil; ) {
length++;
var next = $data.find(node,rest,null).next();
if (!next || next == node) {
node = nil;
}
else {
node = next;
}
}
because the rdf:nil instance delivered by the $data.find is another JS
object. Compare by URIs instead.
To pass in ex:minSize, just declare it as
function myMinOccur ($this, $minSize)
and the engine should bind that variable automatically.
Holger
On 28/02/2020 00:04, Angelo Frozza wrote:
Ralph,
True, there was this error.
Thanks.
I already corrected it in the online version of the function.
But the problem of infinite looping continues.
Hugs,
Angelo
Em quinta-feira, 27 de fevereiro de 2020 10:55:15 UTC-3, Ralph Hodgson
escreveu:
Angelo
Just a first glance. I noticed a spelling mistake: lenght++;
Ralph Hodgson, @ralphtq
CTO, TopQuadrant, @TopQuadrant
On Feb 27, 2020, at 8:44 AM, Angelo Frozza <fro...@gmail.com
<javascript:>> wrote:
Hi,
I'm creating a function to test the minimum number of elements in
an rdf:List. I am using the SHACL-API to run this function.
I can't use sh:minCount or sh:maxCount because they disregard the
existence of duplicate elements in the rdf:List, and in my case
study, I can have more than one element with the same value in
the rdf:List.
The function code is:
|
function myMinOccur ($this) {
// Defines an array for the return
var results = [];
// Defines the the IRI of the target node
var propertyName =
TermFactory.namedNode("http://www.example.org#coordinates
<http://www.example.org#coordinates>");
var rest =
TermFactory.namedNode("http://www.w3.org/1999/02/22-rdf-syntax-ns#rest
<http://www.w3.org/1999/02/22-rdf-syntax-ns#rest>");
var nil =
TermFactory.namedNode("http://www.w3.org/1999/02/22-rdf-syntax-ns#nil
<http://www.w3.org/1999/02/22-rdf-syntax-ns#nil>");
// 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()) {
// Each instance is a Javascript object
var node = t.object;
var head = node;
var lenght = 0;
// This loop runs thorugh the list and
// counts how many elements are in the list.
for ( ; node !== nil; ) {
lenght++;
var next = $data.find(node,rest,null).next();
if (!next || next == node) { node = nil; }
else {node = next;}
}
// If the list lenght < 2 ($minSize), then it is an outlier.
if (length < 2 ) {
results.push({
value : head
});
}
}
return results;
}
|
I have two problems/doubts in this code:
a) the inner loop is apparently looping, that is, it cannot find
the end of the list.
b) How do I pass the value of ex:minSize to the function?
The problem in (a) was discussed, but with no solution, here:
https://github.com/linkeddata/rdflib.js/issues/169
<https://github.com/linkeddata/rdflib.js/issues/169>
I tested the function with the rdflib.js and rdflib-graph.js
libraries found at (https://github.com/TopQuadrant/shacl-js
<https://github.com/TopQuadrant/shacl-js>) and it worked perfectly.
However, in this test, the loop mentioned in (a) is replaced by
length = node.elements.length, which is not supported by the
SHACL-API.
Attached are the shape graph and data graph files used in the tests.
The function is found at
http://54.201.29.21/shapes/Case_1-Functions_iterator.js
<http://54.201.29.21/shapes/Case_1-Functions_iterator.js>.
Best regards,
Angelo
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<Case_1-DataGraph.ttl>
<Case_1-ShapeGraph.ttl>
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