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Reparametrization invariant theories have a vanishing Hamiltonian and enforcetheir dynamics through a constraint. We specifically choose the Dirac procedureof quantization before the introduction of constraints. Consequently, for fieldtheories, and prior to the introduction of any constraints, it is argued thatthe original field operator representation should be ultralocal in order toremain totally unbiased toward those field correlations that will be imposed bythe constraints. It is shown that relativistic free and interacting theoriescan be completely recovered starting from ultralocal representations followedby a careful enforcement of the appropriate constraints. In so doing allunnecessary features of the original ultralocal representation disappear.  The present discussion is germane to a recent theory of affine quantumgravity in which ultralocal field representations have been invoked before theimposition of constraints.Comment: 17 pages, LaTeX, no figure

Ultralocal fields and their relevance for reparametrization-invariant quantum field theory