DC10-30 FLC UNABLE TO COMPLY WITH SID'S XING RESTR.

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FLT WAS CLRED FROM FRANKFURT; GERMANY; EDDF TO DEST VIA RWY 25L WITH THE NAPIT 1 GULF SID. THERE IS A 25000 FT XING RESTR AT NAPIT INTXN FOR DEPARTING ACFT WITH THE RTE WE WERE CLRED. NAPIT INTXN IS 83 MI NW OF EDAF; AND SINCE WE WERE DEPARTING RWY 25L; THIS WAS ALMOST A STRAIGHT OUT DEP. DURING THE PREDEP BRIEFING; THE FLC TALKED ABOUT THE ACFT'S ABILITY TO MAKE THIS XING RESTR AT A NEAR MAX TKOF WT. IT WAS DETERMINED THAT A MAX EFFORT CLB WOULD BE MADE USING MAX CONTINUOUS PWR; OR TKOF PWR INSTEAD OF CLB PWR; AND ALSO USING 0 DEG/RETRACT MANEUVER SPD (BEST ANGLE OF CLB SPD) INSTEAD OF 320 KTS CLB SPD. THE CLB WENT VERY WELL UNTIL ABOUT FL220; WHEN OUR CLB RATE DECREASED; AND IT BECAME APPARENT THE XING RESTR WOULD NOT BE MADE. DUE TO FREQ CONGESTION; THE PNF WAS HAVING DIFFICULTY INFORMING DEP OF OUR ABILITY TO MAKE THE XING RESTR. I ENGAGED VERT SPD ON THE FMS TO 2000 FPM CLB IN HOPES OF MAKING NAPIT AT FL250. THE ACFT CROSSED NAPIT AT FL240 AT SLAT RETRACT 10 DEG EXTEND SPD WITH A LOW SPD BUFFET. THE AUTOPLT WAS DISCONNECTED TO PREVENT ANY FURTHER SPD REDUCTION AND ALSO TO PREVENT THE ON COURSE TURN WHICH WOULD HAVE PUT US INTO A POSSIBLE STALL SIT. AFTER EXPLAINING OUR SIT TO DEP WE WERE CLRED DIRECT TO A FIX ALONG OUR RTE AND CLBED TO FL280 TO AVOID ANY CONFLICTING TFC. THE FLT PROCEEDED TO THE DEST WITH NO FURTHER COMMENT FROM FRANKFURT RADAR REGARDING THE XING RESTR. THE FLC DISCUSSED WHAT COULD HAVE BEEN DONE TO PREVENT THIS SIT. CAPT HAD PREVIOUSLY TALKED TO COMPANY DISPATCH ABOUT THIS PROB; ASKING ABOUT THE PROBABILITY OF FILING ANOTHER DEP RTE. DISPATCH SAID THEY WOULD LOOK INTO IT. I DON'T RECALL ANY OF THESE TYPES OF CLB/XING RESTRS IN THE UNITED STATES; OTHER THAN FOR TERRAIN AVOIDANCE. DEPENDING ON ACFT WT; OUTSIDE AIR TEMP; AND CAPABILITY OF THAT PARTICULAR ACFT'S ENGS; IT IS MUCH MORE DIFFICULT TO DETERMINE IF A CLB XING RESTR CAN EVEN BE MADE; COMPARED TO A DSCNT XING RESTR. IF A SIMILAR SIT ARISES; I WILL NOT ACCEPT THE SID.