No, you got the system wrong.
When an effect inherits from another it "rewrites" those parts that are common
between the two xml files, keeping the parts that are different. Thus if
runway inherits from terrain the actual runway effect as seen by flightgear
gets a technique 4 of its own (inherited from the terrain effect). So when the
skydome shader is active, it's the technique 4 in this runway effect that is
active, which then uses the textures specified in the runway effect, as it's
supposed to.
Regards,
Emilian
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