  We consider a generic scenario of spontaneous breaking of supersymmetry in
the hidden sector within N=1 supersymmetric orientifold compactifications of
type II string theories with D-branes that support semi-realistic chiral gauge
theories. The soft breaking terms in the visible sector of the models are
computed in a standard way without specifying the breaking mechanism, which
leads to expressions that generalize those formerly known for heterotic or type
I string models. The elements of the effective tree level supergravity action
relevant for this, such as the Kahler metric for the matter fields, the
superpotential of the visible sector and the gauge kinetic functions, are
specified by dimensional reduction and duality arguments. As phenomenological
applications we argue that gauge coupling unification can only occur in special
regions of the moduli space; we show that flavor changing neutral currents can
be suppressed sufficiently for a wide range of parameters, and we briefly
address the issues of CP violation, electric dipole moments and dark matter, as
well.
