The definition of assembly model space

Hi Guy:

I am new in solidworks. Does anybody know the definition of assembly model space, I got from the doc : http://help.solidworks.com/2019/english/api/sldworksapi/solidworks.interop.sldworks~solidworks.interop.sldworks.imateentity2~entityparams.html?

I know the model space which is the local space of a assemble part. I also transform localtion of model space to world space via api :

swPt = (MathPoint)swPt.MultiplyTransform(swXform);

But I cant get the right location of assembly location which got from mateEntity via this api.

Does anybody know the definition of assembly model space. How can i get the right world location of assembly?
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