Remove institution reference from instantiations.

src/main/kotlin/builder/DigitalObject.kt

@@ -28,7 +28,6 @@ class DigitalObject(id: String, institutionId: String, count: Int) : Instantiati
     init {
         addRdfType(RICO.Instantiation)
         resource.addProperty(RICO.type, "digitalObject")
-        resource.addProperty(RICO.heldBy, institutionUri)
         addIdentifier("main", resource.uri, model.createResource(uri(NS.memint, "Memoriav")))
     }
 }
\ No newline at end of file

src/main/kotlin/builder/PhysicalObject.kt

@@ -28,7 +28,6 @@ class PhysicalObject(id: String, institutionId: String, count: Int) : Instantiat
     init {
         addRdfType(RICO.Instantiation)
         resource.addProperty(RICO.type, "physicalObject")
-        resource.addProperty(RICO.heldBy, institutionUri)
         addIdentifier("main", resource.uri, model.createResource(uri(NS.memint, "Memoriav")))
     }
 }
\ No newline at end of file