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In the case of electromagnetic waves it is necessary to distinguish betweeninward and outward on-shell integral equations. Both kinds of equation arederived. A correct implementation of the photonic KKR method then requires theinward equations and it follows directly from them. A derivation of the KKRmethod from a variational principle is also outlined. Rather surprisingly, thevariational KKR method cannot be entirely written in terms of surface integralsunless permeabilities are piecewise constant. Both kinds of photonic KKR methoduse the standard structure constants of the electronic KKR method and henceallow for a direct numerical application. As a by-product, matching rules areobtained for derivatives of fields on different sides of the discontinuity ofpermeabilities.  Key words: The Maxwell equations, photonic band gap calculationsComment: (to appear in J. Phys. : Cond. Matter), Latex 17 pp, PRA-HEP 93/10  (exclusively English and unimportant misprints corrected

Inward and outward integral equations and the KKR method for photons