A stating is a statement existing in a model.
The M&S (Ch 6) says:
TheDescriptionelement itself represents an instance of a Bag resource. The members of this Bag are the resources corresponding to the reification of each of the statements in theDescription. If thebagIDattribute is specified its value is the identifier of this Bag, else the Bag is anonymous.
A document with RDF serialized as XML will have its statements represented as statings in the corresponding model. The URI of the stating resource will be the same as the URI for the reified statement contained in the Description bag.
The stating is represented in the system by a node. The object has one node reference each for a subject (SUBJ), predicate (PRED) and object (OBJ). These three slots represents the implicit statings that makes up a reified statement. They can, in the rare cases its necessary, be refered to by the aliasing functionality.
The model of the stating is stored in the MODEL slot of the node. The same slot is used for the model of the implicit statings. But the implicit statings are infered from the model, and does actually not belong to the model. I have not yet decided on how this distinction will be handled.
Two models can contain the same statement. The URI of the resource corresponding to the reification of the statement will in most cases be unique. URIs generated for anonymous resources is guaranteed to be unique.
If a URI, not within the model namespace, is explicitly given to a statement by the model, it will be interpreted by Wraf as refereing to a specific stating. In this case, it is possible that two models talks about the same stating but gives them diffrent properties. They may not give the statement resource the same predicate, subject and object.
Wraf expects every stating to exist in exactly one model. Wraf will treat statings with the same URI existing in more than one model as a special case. A normal stating will internally be represented in the system as a node. In the special case, each implicit stating will be made explicit.
The MULTI representation is not implemented