VOID query equivalent to the _fetchStructure in endpoints.js

[JervenBolleman]

As an alternative to SHACL for quite a few SIB endpoints we have an extended VOID file in the Service Description.

BASE <http://rdfs.org/ns/void#>
PREFIX v:<http://ldf.fi/void-ext#>
PREFIX s:<http://www.w3.org/ns/sparql-service-description#>
SELECT ?cls ?property ?linkType ?dataType
WHERE {
BIND(<${this.graph}> AS ?name)
[] s:name ?name; 
    s:graph/:classPartition ?classPartition .
?classPartition :class ?cls ; 
  :propertyPartition ?propertyPartition ; 
  :property ?property .
OPTIONAL { ?propertyPartition :classPartition/:class ?linkType }
OPTIONAL { ?propertyPartition v:datatypePartition/v:datatype ?dataType }
}

This could be used as a second alternative for ShACL.