Why restrict a resource to only one LDPC?

Section 5.2.2 of http://www.w3.org/TR/2013/WD-ldp-20130307 states

The same resource, identified by its canonical URI, must be a member of
> only a single LDPC.  The same resource can not be a member of multiple
> LDPCs.


What is the reason for such a restriction?
It seems perfectly reasonable for a given Person resource to appear in two
different containers such as:

http://example.com/resources/persons/

and

http://example.com/resources/corporations/292837/employees/

Regards,
Greg McFall