  A Kohn-Sham time-dependent local-density-functional scheme is utilized to
predict attosecond time delays of xenon 4d photoionization that involves the 4d
giant dipole resonance and Cooper minimum. The fundamental effect of electron
correlations to uniquely determine the delay at both regions is demonstrated.
In particular, for the giant dipole resonance, the delay underpins strong
collective effect, emulating the recent prediction at C60 giant plasmon
resonance [T. Barillot et al, Phys. Rev. A 91, 033413 (2015)]. For the Cooper
minimum, a qualitative similarity with a photorecombination experiment near
argon 3p minimum [S. B. Schoun et al, Phys. Rev. Lett. 112, 153001 (2014)] is
found. The result should encourage attosecond measurements of Xe 4d
photoemission.
