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XGMII or SPI-4 ?

Hi all,
Maybe this thread has been discussed before, but I just added in this mailing list for a few days.
Can anyone tell me which one ( XGMII or SPI-4) will be adopted for implementation between
link-layer and physical-layer device? The 10G standard proposes XGMII, while it seems to be that
vendors favor SPI-4, right? Or maybe this two interfaces can co-exist ??
Thanks a lot!