[Closed] Xref Object materials

I’m pretty sure the answer to this will be no, but:

 Is it possible to access the separate proxy and object materials from an xref ?
 
 This is wrong, but to help illustrate my question in [b][i]suedo code[/i][/b]:
 
 is it possible to do?obj = $ classOf  XrefObject   [indent]a = obj.proxy.material 
 [/indent][indent]b = obj.xref.material  


 [/indent]And if this is possible, would it also be possible to assign materials to say the proxy object/mesh object, without openning the Source file.  
 
 I understand how xref's work, this is just for a test.
 
 Thanks for your time.