what space is this Matrix in?

In Blender 2.6 API, PoseBone is used for animating a bone. PoseBone.matrix is one way to do that. API says PoseBone.matrix is in "object space".

http://www.blender.org/documentation/blender_python_api_2_63_5/bpy.types.PoseBone.html#bpy.types.PoseBone.matrix

PoseBone.matrix is nothing I've seen at all. I still can't get my animation importer working. What's the deal with PoseBone.matrix? In Blender 2.4 API there were two matrices: one in local space, one in armature space.

But the new PoseBone.matrix is neither! It's not a local matrix:

Position isn't local, it's global.

But rotation

<Euler (x=1.5708, y=-0.7854, z=-0.0000), order='XYZ'> 

is.

So what is this "object space" that the API says PoseBone.matrix is in?

I'm trying to assign my armature-space matrices to a hierarchial armature and I can't get them right.

I tried decomposing the matrices I have, undoing parent rotations then recomposing the matrix again before setting it as "PoseBone.matrix". It just doesn't work.

oldmatrix = myMatrix
loc, rot, scale = oldmatrix.decompose()

#rot = rot * pose.bones[bonename].parent.rotation_quaternion.conjugated()
for i in pose.bones[bonename].parent_recursive:
   rot = rot * i.conjugated()

newmatrix = rot.to_matrix().to_4x4()

newmatrix[0][3] = loc.x
newmatrix[1][3] = loc.y
newmatrix[2][3] = loc.z

pose.bones[bonename].matrix = newmatrix