Index: doc/next-migration.txt
===================================================================
diff -u -N -r56f48a605e58baed9ed8d0f4d43cd704bf34811d -rea3bbe8b1039c45baa2c027c005151e04e57d4b1
--- doc/next-migration.txt	(.../next-migration.txt)	(revision 56f48a605e58baed9ed8d0f4d43cd704bf34811d)
+++ doc/next-migration.txt	(.../next-migration.txt)	(revision ea3bbe8b1039c45baa2c027c005151e04e57d4b1)
@@ -2485,17 +2485,25 @@
 ----------------
 |[source,tcl]
 ----------------
-# Check if object is a class
-/obj/ info is class
+cd # Check if object is an NX class
+/obj/ has type ::nx::Class
+
+# Check if object is a class in one of the 
+# NSF object systems
+::nsf::is class /obj/
 ----------------
 |[source,tcl]
 ----------------
 /obj/ ismetaclass /cls/
 ----------------
 |[source,tcl]
 ----------------
-# Check if object is a metaclass
-/obj/ info is metaclass 
+# Check if class is an NX metaclass
+expr {[/cls/ info heritage ::nx::Class] ne ""}
+
+# Check if object is a metaclass in one of the 
+# NSF object systems
+::nsf::is metaclass /obj/
 ----------------
 |[source,tcl]
 ----------------
@@ -2504,7 +2512,7 @@
 |[source,tcl]
 ----------------
 # Check if object is a baseclass of an object system
-/obj/ info is baseclass
+::nsf::is baseclass /obj/
 ----------------
 |[source,tcl]
 ----------------