yes I open each level and go to full depth and then close all
is this inefficient ..should I use absolute paths?

what I do is : 
for each of T1 to T300
    idT1 = open(T1)
    for each of V1 to V60
          idV1 = open (idT1, relative path from T1 to V1)
          readAttribute(idV1, attribute name)
          idD =  open(idV1, relative path from V1 to D)
          readAttribute(idD, attribute name)
          close(idD)
          close(idV1)
     end for
     close(idT1)
end for


          




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