when operning an XML file the main points are

<Model>*******.model</Model>
^ ^
this is the model that is being used for placing
down or for the model that is being fired

<PlaceCost>*********</PlaceCost>
^ ^
= how much the trap costs to place (dur) :P

<PlaceCeiling/>
^ ^
this is where the trap can be placed <PlaceCeiling/> <PlaceFlat/> <PlaceVertical/> there is some specials <PlaceFlatNoGrid/> and 2 that i don't know <PlaceNoTracks/> and <PlaceRotation/>

<Rate>****.**</Rate>
^ ^
this is how long it takes for the trap to fire (higher the number the longer it takes to fire. so a Negative number (-100) means it will fire VERY fast

<MaxRange>******</MaxRange>
^ ^ ^ ^
im sure you dont need me to tell you what this means :)

<Amount>********</Amount>
^ ^ ^ ^
this is the amount of damage a trap does



if you want to add any thing that i have not put (like how to stun or turn damage into bleeding or burning or freezing free free to add your input in the way i have done so other people understand it better ill edit this post :)