Is the relativistic Structure of Spacetime Ontic or Epistemic?

As repeatedly emphasized by Einstein our knowledge of the structure of space and time is based entirely on inferences from observations of physical objects and processes. At the most fundamental level these objects and processes are described by quantum theory. However, the ontological status of the theoretical entities employed by quantum theory is a matter of considerable debate. Furthermore, the nonlocal correlations identified by Bell cannot readily be explained within the standard relativistic framework. This suggests that we should re-examine our understanding of spacetime.