WHILE PARKING; DESPITE THE PRESENCE OF A MARSHALLER AND 2 WING WALKERS; AN MD88 STRIKES A WINGTIP AND IS DAMAGED.

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WE WERE BEING MARSHALLED IN TO THE GATE IN EWR. THE MARSHALLING AGENT AND 2 WING WALKERS WERE IN POS. IT APPEARED AS EVERYTHING IN THE RAMP AREA WAS WHERE IT WAS SUPPOSED TO BE. THE L WING WALKER WAS POSITIONED TO THE INSIDE OF GND EQUIP IN WHAT APPEARED TO BE A NORMAL PARKING POS. THE R WING WALKER WAS ALSO POSITIONED TO THE INSIDE OF GND EQUIP IN WHAT APPEARED A NORMAL PARKING POS. THE MARSHALLING AGENT SIGNALED US IN AS NORMAL AND THE WING WALKERS WERE BOTH GIVING AN ALL CLR SIGNAL. THE L WING WALKER WAS GIVING US AN ALL CLR SIGNAL UNTIL HE WAS NO LONGER IN VIEW FROM THE L SIDE WINDOW. WE FELT A SLIGHT BUMP AS THE MARSHALLING AGENT SIGNALED THE ACFT IN. THE CAPT STOPPED THE ACFT. THERE WAS NEVER ANY KIND OF STOP SIGNAL GIVEN BY THE MARSHALLING AGENT UNTIL AFTER THE ACFT WAS STOPPED. A PA WAS MADE TO THE PAX AND FLT ATTENDANTS TO REMAIN IN THEIR SEATS. AFTER A FEW MINS; THE MARSHALLING AGENT SIGNALED US TO CONTINUE PARKING. WE RECORDED THE ACFT DAMAGE IN THE LOGBOOK AND TERMINATED THE FLT. SUPPLEMENTAL INFO FROM ACN 694864: WITH A TREMENDOUS AMOUNT OF FARMING OUT OR CONTRACTING SVCS FOR AIRLINES; TRAINING OF GND SVC PERSONNEL IS BECOMING AN ISSUE THAT NEEDS TO BE ADDRESSED.