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Blender 2.5 API and Bone Constraints

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I am in the process of modifying the Blender FBX export script to include some missing features. I'm trying to get the constraints of a bone inside an armature but I see no constraints property like objects have. Here is what I have done to get the rotation constraints of an object:

rot_min = [0, 0, 0]
rot_max = [0, 0, 0]
rot_limit = [0, 0, 0]
if ob != None:
for constraint in ob.constraints:
if constraint.type == 'LIMIT_ROTATION':
rot_min = [int(round(180 / math.pi * constraint.min_x)), int(round(180 / math.pi * constraint.min_y)), int(round(180 / math.pi * constraint.min_z))]
rot_max = [int(round(180 / math.pi * constraint.max_x)), int(round(180 / math.pi * constraint.max_y)), int(round(180 / math.pi * constraint.max_z))]
rot_limit = [int(constraint.use_limit_x), int(constraint.use_limit_y), int(constraint.use_limit_z)]

This works great for objects but it is not what I am trying to achieve. The main modification I am trying to get working is rotation constraints on bones so that my rag dolls will work but when the ob variable is a bone the script fails because bones do not have a constraints property.

I have looked at all properties in bpy.data.armatures and bpy.data.armatures.bones but I see nothing about constraints so I am very lost. I would very much appreciate any help I can get.

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