We present a new formalism which systematically accounts for nucleon compositeness in nuclear scattering amplitudes, consistent with quantum chromodynamics and covariance. Reduced gauge-invariant nuclear amplitudes are defined which have elementary quantum chromodynamic scaling properties. The procedure is applied to the photodisintegration and electrodisintegration of the deuteron as a test of nuclear chromodynamics and as a method to isolate contributions of dibaryon resonances. NUCLEAR REACTIONS Treatment of nucleon compositeness; general formalism developed. Applied to d(p)n, d(e,p)n, E1 GeV; calculated (), background to dibaryon resonances. Compared () with available data.