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In this paper, we work out in detail the tadpole cancellation conditions aswell as the generalized Green-Schwarz mechanism for type IIB orientifoldcompactifications with D3- and D7-branes. We find that not only the well-knownD3- and D7-tadpole conditions have to be satisfied, but in general also thevanishing of the induced D5-brane charges leads to a non-trivial constraint. Infact, for the case $h^{1,1}_{-} \neq 0$ the latter condition is important forthe cancellation of chiral anomalies. We also extend our analysis by includingD9- as well as D5-branes and determine the rules for computing the chiralspectrum of the combined system.

The Generalized Green-Schwarz Mechanism for Type IIB Orientifolds with D3- and D7-Branes