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We construct the effective chiral Lagrangian involving the  D--mesons and Goldstone bosons at next-to-leading order taking into accountstrong as well as electromagnetic interactions. This allows us to disentangle-- to leading order in isospin violation -- the electromagnetic and the strongcontribution to the D--meson mass differences. In addition, we also apply theinteraction to the decay D_{s0}^*(2317)-> D_s pi0 under the assumption that theD_{s0}^*(2317) is a hadronic molecule. We find (180+-110) keV for the decaywidth $\Gamma (D_{s0}^*(2317)-> D_s pi0) -- consistent with currently existingexperimental constraints as well as previous theoretical investigations. Theresult provides further evidence that this decay width can serve as a criterionfor testing the nature of the D_{s0}^*(2317).

Subleading contributions to the width of the D_{s0}*(2317)