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";);
var rest =
TermFactory.namedNode("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";);
// 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
I tested the function with the rdflib.js and rdflib-graph.js libraries
found at (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.
Best regards,
Angelo
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Case_1-DataGraph.ttl
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Case_1-ShapeGraph.ttl
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