PREFIX ecv: <https://example.org/ecv#>
PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

<CapabilityShape> {
  a [ecv:Capability] ;
  ecv:hasRequirement IRI + ;
  ecv:hasConstraint @<ConstraintShape> *
}

<ConstraintShape> {
  a [ecv:Constraint] ;
  ecv:maxRequests xsd:integer ?
}