Mass - Energy - Momentum : Only there because of Spacetime ?

I describe how relativistic field theory generalises the paradigm property of material systems, the possession of mass, to the requirement that they have a mass-energy-momentum density tensor Tμν associated with them. I argue that Tμν does not represent an intrinsic property of matter. For it will become evident that the definition of Tμν depends on the metric field gμν in a variety of ways. Accordingly, since gμν represents the geometry of spacetime itself, the properties of mass, stress, energy and momentum should not be seen as intrinsic properties of matter, but as relational properties that material systems have only in virtue of their relation to spacetime structure.