SMT PARKED ON TXWY IS STRUCK FROM THE REAR BY ANOTHER SMT THAT JUST LANDED.

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ANNOUNCED OVER CTAF FREQ THAT WE WERE TAXIING OUT TO HOLD SHORT OF RWY 13-31. WE COMMENCED TAXI USING ALL EXTERIOR LIGHTS; EXCEPT THE STROBES; BECAUSE IT WAS DARK AND VISIBILITY WAS FURTHER REDUCED BY LIGHT SNOW. WHILE TAXIING OUT; WE WERE INFORMED BY ERIE APCH CTL ON OUR #2 RADIO THAT AN ACFT WAS ON APCH TO THE ARPT. THIS FACT; IN COMBINATION WITH THE EXISTING WX CONDITIONS; PRECIPITATED OUR DECISION TO HOLD SHORT OF ALL THE RWYS. OUR TAXI RTE DID NOT CROSS ANY RWY. WE PARKED THE ACFT; SETTING THE PARKING BRAKE; COMPLETED OUR PRE-TKOF CHKLIST AND AWAITED CLRNC FROM ATC. BECAUSE VISIBILITY WAS REDUCED BY THE LIGHT SNOW; ALL EXTERIOR LIGHTS; INCLUDING NAV LIGHTS; BEACON; TAXI LIGHT; LNDG LIGHTS; AND WING ICE LIGHTS REMAINED ON. ALL LIGHTS WERE VERIFIED OPERATIONAL DURING PREFLT INSPECTION BY BOTH FLC MEMBERS. SHORTLY AFTER; AN ACFT LANDED ON RWY 25; TURNED OFF. THE PLT REQUESTED INFO FROM THE UNICOM OPERATOR ON THE STATUS OF A HANGAR ON THE ARPT WHOSE LOCATION WAS BOTH UNKNOWN TO US AND UNPUBLISHED. SEVERAL MINS LATER WE FELT AN IMPACT AND THE PLT OF THE ACFT INFORMED US OVER CTAF THAT HE HAD HIT US. AN INSPECTION REVEALED THE ACFT HAD STRUCK OUR ACFT FROM THE REAR; HIS R WING HAD DAMAGED A VENT ON THE BOTTOM OF OUR FUSELAGE. NO INJURIES WERE RPTED AND DAMAGE TO OUR ACFT WAS MINOR. THE PROB WAS A COMBINATION OF THE OTHER PLT'S LACK OF VIGILANCE WHILE TAXIING IN LOW VISIBILITY CONDITIONS CAUSED BY DARKNESS AND LIGHT SNOW; AND USING NON-STD RADIO PHRASEOLOGY NOT SPECIFYING A DISCERNABLE TAXI RTE. HAD WE KNOWN HIS RTE AND INTENTIONS; WE COULD HAVE RESTATED OUR POS ON THE ARPT.