Before revision:  As an application we study L_2-norm sampling discretization and recovery of functions in RKHS on D \subset \mathbb{R \R ^d based on random function samples , where we only assume the finite trace of the kernel .
After revision:  As an application we study L_2-norm sampling discretization and sampling recovery of complex-valued functions in RKHS on D \subset \mathbb{R \R ^d based on random function samples , where we only assume the finite trace of the kernel .