Make sense of the map files

[jjrh]

Currently I cannot find any information on the mapping files.
example:

L 1889.0000, -3787.0000, 6.0000, 1887.0000, -3794.0000, 6.0000, 0, 0, 0
1 2 3 4 5 6 7 8 9 10
Type, X1, Y1, Z1(??), X2, Y2, Z2(??), ??, ??, ??

I know that L means line. X1, Y1, X2, Y2 are the 2d cords, and i'm fairly sure the third one is the Z cords. The last 3 items I have no
clue what they are for.

P 1202.7050, -2094.7271, 24.3320, 0, 0, 0, 2, Smith_Tv`ysa
1 2 3 4 5 6 7 8 9
This is clearly some sort of map location(P == point?). It appears to be missing a argument compared to the type L.

I haven't done any research other than a quick google, so some time needs to be spent finding out if this is documented anywhere. (note I used http://www.mapfiend.net/ to download this map, as I keep forgetting my usb key with my eq folder on it)