cacontology-infrastructure:PaymentSystemCrossReferenceShape leaf node

@prefix cacontology-infrastructure: <https://cacontology.projectvic.org/infrastructure#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix sh: <http://www.w3.org/ns/shacl#> .
cacontology-infrastructure:PaymentSystemCrossReferenceShape a sh:NodeShape ;
    rdfs:label "Payment System Cross Reference Shape"@en ;
    rdfs:comment "Validates payment system relationships for monetized platforms."@en ;
    sh:sparql [ sh:message "Monetized platform infrastructure should have payment processing systems."@en ;
            sh:select """
            SELECT $this
            WHERE {
                $this a cacontology-infrastructure:PlatformInfrastructure ;
                ?payment cacontology-infrastructure:monthlyRevenue ?revenue .
                FILTER (?revenue > 0)
                FILTER NOT EXISTS {
                    $this cacontology-infrastructure:usesPaymentSystem ?payment .
                }
            }
        """ ] ;
    sh:targetClass cacontology-infrastructure:PlatformInfrastructure .