Has anyone figured out .nodes files?

[FragdaddyXXL]

I was looking at some of Amnesia's source files and I noticed a 10_daniels_room_servant_grunt.nodes file. I was wondering if anyone knows of an easy way to make one. I say easy because one of the values needed are distance values between each node. Ex.

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<Node Name="PathNodeArea_1" ID="580">
        <Edge Node="PathNodeArea_28" Distance="1.67661678791046142578" />
        <Edge Node="PathNodeArea_25" Distance="1.74686419963836669922" />
        <Edge Node="PathNodeArea_4" Distance="2.35236239433288574219" />
        <Edge Node="PathNodeArea_2" Distance="3.08871102333068847656" />
        <Edge Node="PathNodeArea_29" Distance="3.24689984321594238281" />
        <Edge Node="PathNodeArea_7" Distance="4.88411092758178710938" />
    </Node>

Of course it's possible to calculate the distance between two points, but it would be quite tedious to do so. Or am I just crazy, and that Distance value means something else completely. I would like to use such a file so that I can just clear the current path nodes from the AI and call up paths that I have already pre-made.

Oh, and they use it like so:

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AddEnemyPatrolNode("grunt_normal_1", "PathNodeArea_28", 0, "");

Or is that just how far the enemy can stray from the nodes?