First of all, thank you for responding @sysgate
I found out that "device (driver) model tree" in Linux context is the synonym collocation for "nexus and leaf drivers" in the context of Solaris.
There is also a correspondance of the /devices folder under Solaris and the sysfs under Linux, for describing the structure of the buses and devices present in the system.
I post this only as a closing statement, in the hope that it will be useful for someone who asks himself similar questions as I did.
P.S. Correct me if I'm defective on the above statements.