A B737-300 TAXIING FROM THE GATE AT ORD HAD A CONFLICT WITH A TRUCK AND THEN AN EMB170.

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AFTER LNDG ON RWY 6L AT CYYZ IN LIGHT RAIN A L TURN ON HIGH SPEED EXIT C3 WAS MADE FOLLOWED BY ANOTHER L TURN ON TO TXWY CHARLIE. CLRNC WAS GIVEN TO HOLD SHORT OF TXWY C1; NEXT CLRNC GIVEN WAS A R ONTO TXWY A AND HOLD SHORT OF AK. PRIOR TO TXWY A I TURNED TOWARDS TXWY A ON WHAT LOOKED LIKE A TAXI LINE. DUE TO THE WET SURFACE TAXIING WAS AT A SLOW SPEED. I COULD SEE GREEN TAXI LIGHTS AHEAD; BUT DUE TO THE DARKNESS; WET TXWYS; THE LINE I FOLLOWED WAS NOT TXWY A. GND CTL ASKED ABOUT OUR POS AND THAT'S WHEN WE DISCOVERED I HAD TURNED TOO SHARP TOWARDS A CLOSED AREA AND THE LIGHTS I WAS LOOKING AT WERE ACTUALLY DP NOT A. THERE WERE NO VISUAL INDICATIONS OF A CLOSED AREA THAT WE SAW; PLUS WE HAD THOROUGH TAXI BRIEFING SINCE WE UNFAMILIAR WITH THE ARPT. GND CTL SENT OUT A MAINT TRUCK TO ASSESS THE SITUATION. HE MOVED TWO REMOVABLE REFLECTORS AND WE CONTINUED TO TAXI. IT WAS TOO SLICK DUE TO THE RAIN TO MAKE THE TURN SUCCESSFULLY BACK TO TXWY A. I ASKED FOR A TELEPHONE NUMBER FOR THE GND CTLR AFTER THEY SAID THIS WAS GOING TO BE RPTED. TALKING TO THE SENIOR CTLR I WAS TOLD ONLY A LOG ENTRY WAS BEING MADE AND THAT THIS WAS A COMMON MISTAKE AND NOTHING FURTHER FROM HIS END WAS GOING TO BE PURSUED. HE SAID THE ONLY REASON FOR THE LOG ENTRY WAS BECAUSE THE MAINT TRUCK WAS CALLED. NO MARKINGS ON THE TAXI DIAGRAM SHOW A CLOSED AREA OR OTHER OUTSIDE IDENTIFIERS; NOR ANY NOTAM. I BELIEVE IF THIS IS A COMMON MISTAKE THAT BETTER IDENTIFICATION SHOULD BE AVAILABLE.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED HE HAS SINCE DISCOVERED THE ARPT PAGE WAS IN ERROR. BASED ON THE ARPT PAGE HE THOUGHT THAT THE ONLY TXWY AVAILABLE TURNING TO THE R WOULD BE A. HE LATER CHKED AND DISCOVERED THAT DP CONNECTS BOTH C AND D TO THE RAMP AND CAN BE ACCESSED FROM CHARLIE AT THE SAME INTXN AS A.