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I don't follow this argumentation. I don't see that the bNode leads to any problems when the descriptor set is defined independent on any DR. Maybe there is a misunderstanding in what the above example means. The existential variable isn't about resources from a DR, but about the values of a descriptor for such resources. The construct above tells the following: If the above descriptorset is defined for some DR, and r is a resource in that DR (i.e. if r is in the IRI-set defined by that DR), then there /exists/ some x, being an instance of class Wood, where x has a shiny finish and is made of cedar, and the following relationship holds: 'r ex:material x'. the existential variable x appears on the /right/ hand side of the relationship! If this was a misunderstanding, then I suggest to simply remove the whole paragraph.