Testing first extensions. Maybe a more minimal infrastructure can be used.

src/LepiterPlugins/GfLeSnippet.class.st

@@ -0,0 +1,5 @@
+Class {
+	#name : #GfLeSnippet,
+	#superclass : #Object,
+	#category : #LepiterPlugins
+}

src/LepiterPlugins/LeSnippet.extension.st

@@ -0,0 +1,8 @@
+Extension { #name : #LeSnippet }
+
+{ #category : #'*LepiterPlugins' }
+LeSnippet >> index [
+	| uuids |
+	uuids := self parent children collect: [:each | each uidString ].
+	^ uuids
+]