It is shown that, while generalized vector dominance is strictly applicable in the diffractive limit ($\nu \to \infty$, any $Q^2\ge 0$ such that $x\equiv \frac{Q^2}{2M\nu }\to 0$) of electron-nucleon scattering and the parton model is applicable in the scaling limit ($Q^2\to \infty , x$ fixed), these two models are identical for describing the deep diffractive limit ($Q^2\to \infty$, $x\to 0$). This equivalence is then used to interpret the different contributions of vector hadronic states which couple to the photon. A new scaling variable $\tilde{x}$ comes out naturally from our analysis.

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