Sparql constraints

[Julie Budaher]

Hi,

Sorry for the basic question , but I am eventually new to this domain.

I am confused about the difference between a sparql query and a sparql constraint that is added in order to inference new triples. I have sparql queries that I need to put them in the form of shacl rules in order to make inference, and when I add the sparql query in sh:sparql, I am getting an error saying:Error: value must be an instance of sparql constraint. Can someone explain to me, please, how can I use these sparql queries as sparql constraints ? Thank you in advance

[Holger Knublauch]

Hi Julie,

I assume you want to instantiate sh:SPARQLRule https://w3c.github.io/shacl/shacl-af/#SPARQLRule

and link a class/shape with that rule using sh:rule. sh:sparql is used for constraints, not inference rules.

You can see an example of this in the datacube.shapes.ttl file:

qb:ComponentPropertyRuleShape
  a sh:NodeShape ;
  rdfs:comment "A SHACL rule that can be used to infer additional triples that copies all values of the sub-properties of qb:componentProperty into qb:componentProperty itself. This is needed because many constraints here only reference qb:componentProperty." ;
  sh:rule [
      a sh:SPARQLRule ;
      sh:construct """CONSTRUCT {
    ?subject qb:componentProperty ?object .
}
WHERE {
    ?subject qb:attribute|qb:dimension|qb:measure|qb:measureDimension ?object .
}""" ;
      sh:order 0 ;
      sh:prefixes <http://topbraid.org/datacube> ;
    ] ;
  sh:targetNode sh:this ;
.

and many more in the file owl2shacl.ttl

One area where every newcomer seems to trip over is how to use sh:prefixes. To get started and keep it simple you may want to just place them as PREFIX declarations into each rule. Otherwise, https://www.w3.org/TR/shacl/#sparql-prefixes

Holger

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[Julie Budaher]

Hi Holger,

Thank you for your response and the detailed information.

Julie