diff --git a/input/fsh/SGImplementationGuide.fsh b/input/fsh/SGImplementationGuide.fsh
index bdc6ba79..18859d0d 100644
--- a/input/fsh/SGImplementationGuide.fsh
+++ b/input/fsh/SGImplementationGuide.fsh
@@ -1,4 +1,24 @@
 Profile: SGImplementationGuide
 Parent: ImplementationGuide
 
-* license = #CC-BY-SA-3.0-IGO
\ No newline at end of file
+* license = #CC-BY-SA-3.0-IGO
+
+
+
+
+
+// Define the slicing on the resource.type
+* definition.resource
+  * ^slicing.discriminator.type = #pattern
+  * ^slicing.discriminator.path = "reference.resolve()"
+  * ^slicing.rules = #open
+
+
+* definition.resource contains 
+  LogicalModel 0..* 
+//  Profile 0..* 
+
+* definition.resource[LogicalModel].reference only Reference(SGLogicalModel)
+//* definition.resource[Ppofile].reference only Reference(SGProfile)
+
+