PA28 PLT ENTERED DC ADIZ WITHOUT GETTING A CLRNC OR A DISCRETE XPONDER CODE.

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ON DEC/SUN/03; AT APPROX XG00; I WAS DSNDING WBOUND THROUGH 2000 FT MSL; APPROX 3 MI E OF BAY BRIDGE ARPT (W29) IN STEVENSVILLE; MD; INTENDING TO LAND AT W29. MY AIRPLANE'S XPONDER WAS SQUAWKING XXXX; THE XPONDER CODE SPECIFIED IN NOTAM FDC 3/0347; 'INGRESS/EGRESS TEST PROCS FOR BAY BRIDGE (W29) AND KENTMORR (3W3) ARPTS IN MARYLAND.' I ENTERED THE BALTIMORE/WASHINGTON ADIZ IN ACCORDANCE WITH THE PROC OUTLINED IN THAT NOTAM; STAYING WITHIN THE LATERAL AND VERT BOUNDARIES SPECIFIED FOR APCH TO W29 FROM THE E. UPON ENTRY TO THE TFC PATTERN; THE ARPT UNICOM OPERATOR ASKED ME TO CALL THE POTOMAC ATC/TRACON UPON LNDG; WHICH I DID. THE TRACON OPERATOR TOLD ME THAT THE NOTAM UNDER WHICH I HAD SQUAWKED XXXX AND ENTERED THE ADIZ WAS NO LONGER IN EFFECT; AND THAT UNDER CURRENT NOTAMS I SHOULD HAVE CALLED FSS FOR A DISCRETE XPONDER CODE. THE DUATS BRIEFING I RECEIVED AT XA30 THE SAME MORNING DID NOT INDICATE THAT NOTAM FDC 3/0347 HAD BEEN CANCELED; AND IN FACT INDICATED THAT IT IS STILL IN EFFECT 'THROUGH DEC/WED/03; XA59.' I SAVED THE BRIEFING.