A model is given which treats the exclusive and inclusive reactions unifiedly and is applicable to both the peripheral and large transverse momentum. reactions; inclusive amplitudes Me constructed by assignment of certain factors to urbaryon lines, and the corresponding exclusive amplitudes are obtained by _taking the exclusive limit of specifying the anything state to be a hadron. The model incorporates various types of scaling properties, i.e., the Bjorken scaling, the Feynman scaling, the large transverse momentum scaling and the large angle scaling, and also the Regge-like behaviour of exclusive and inclusive reactions. § 1. Introduction and summary In a series -of papers/>-~> we have investigated inclusive reactions from the viewpoint of the urbaryon line flow. The following points in our work form the bases of the present paper. First, the Mueller amplitude is characterized by - the urbaryon rearrangement diagrams selected by means of the reduction rule of urbaryon lines ;2> the rule is a formulation as to how the simple diagrams represent net contributions of complicated higher order processes. Second, the Mueller amplitude for each diagram is parametrized by an interpolation formula,4> which gives a unified' description of shapes and scaling properties of inclusive spectra at small transverse momentum (PT). The formula exibits a new form of scaling,8> which is related to the Feynman scaling and large PT scaling. Fur thermore, we have extended the formula so as to describe the single-particle spectra 'in the whole kinematical region, including two-body reactions as the ex clusive limit ;6>• 7> the large PT scaling8> of the former and the large angle scaling9> of the latter are ui::tifiedly understood. In this paper, we present a model of hadron interactions, which gives a foundation_ and a generalization of the extended formula. The model also gives a new argument on the Bjorken scaling for the virtual photon-hadron interactions. _ We assume that the hadrons are characterized by the valence urbaryons and hadron interactions are specified by the number of valence urbaryon lines nk!> connecting particles k and l. Hereafter we shall call the urbaryon lines connecting hadrons the urbaryon bond on the analogy of chemical bond. The valence ur baryon may be the key concept to understand the flows of energy-momenta and