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Expression path type,I don't understand,please help me! Feb. 15, 2021, 11:19 a.m.

Expression path type,I don't understand

i am new driver,
At present, I find that different indentations can lead to different results!
I don't understand the difference between these three lines of code

detail("/obj/geo1/foreach_begin1_metadata1","iteration",0)
detail("../foreach_begin1_metadata1","iteration",0)
detail("/../../foreach_begin1_metadata1","iteration",0)

The results of the first two lines are the same, and the bottom line is different