How to produce multiple RDF triples from a string that to be split by a delimiter?

[KMax]

Hi there! We want to implement reconciliation against SKOS concepts from a given SKOS ConceptScheme, see an example below. We work with Morph-KGC currently.

An input CSV file:

study_id, brain_regions
1,allocortex;periallocortex;ventricles of forebrain
2,midbrain (mesencephalon)

We want to reconcile the values from the brain_regions column into IRIs from a given SKOS Concept Scheme, so that we get the following output RDF Turtle file:

<urn:id:1> <urn:id:hasBrainRegion> <https://data.company.com/id/10292>, <https://data.company.com/id/10243>, <https://data.company.com/id/10276> .
<urn:id:2> <urn:id:hasBrainRegion> <https://data.company.com/id/10276> .

Our initial idea was to develop an RML Function which takes the following arguments

• column name,
• IRI of SKOS Concept Scheme,
• IRI of SKOS property, e.g., skos:prefLabel
• delimiter, e.g., ;

and produces an array of IRIs.

However, we discovered that it's not possible, because only a single value, i.e., not an array, can be produced by an RML Function. Is that a correct conclusion? Do you see other ways to achieve the desired behavior?

[bjdmeest]

You could have a look at https://github.com/FnOio/grel-functions-java/blob/master/src/main/java/io/fno/grel/StringFunctions.java#L407 for an example of what kind of arrays are currently supported in RMLMapper-JAVA, but depending on which engine you use, support may vary