There are no isolated statements. They either exist as a stating or they doesn't exist at all. The Wraf is resource centric. Also the statements are properties. That's how I have have done it in Wraf.
Any model can say things about any resource.
But in Wraf, the resource stands for explicit and implicit statings, and those will normally only belong to one model. Wraf connects a large amount of diffrent models. Two models can contain the same statement, but the resource representing the reified statemnent will not have the same URI as that of the same statement in another model. They cold, but Wraf will treat that as a special case. That's too much shorthand.