Many thanks everybody,
Dear aterpster, yes the NOA (FAA) chart is unambiguous. What made me uncertain is a JEPP STAR plate of KDAL. I think, it would be illegal to paste it here but if you have the opportunity you can check it. It is KDAL page 10-2D, the GREGS SIX ARRIVAL. It depicts the arrival segment roughly from north, north-east. At the GREGS intersection there is a note which made me think."TURBOJETS LANDING NORTH EXPECT to cross at 10000'. TURBOJETS LANDING SOUTH EXPECT to cross at 11000'. Therefore, the crossing altitude is higher for those who are making an almost straight in approach than those who are making the longer approach to the north.
Thinking it over there can be an ATC reason behind that, probably the interaction with nearby KDFW traffic.
Cheers,
b