diff --git a/debian/var/models/XML model example (in progress) b/debian/var/models/XML model example (in progress)
index 7e614e1..91cb322 100644
--- a/debian/var/models/XML model example (in progress)	
+++ b/debian/var/models/XML model example (in progress)	
@@ -64,9 +64,36 @@
 
     </state>
 
-    <produced_states id="a computed state" date="00000" author="THE MATRIX (you know it...)">
+    <produced_states id="a computed state" date="000" author="THE MATRIX (you know it...)">
     </produced_states>
-    <transitions></transitions>
+
+    <transitions id="how many ?" date="000" author="THE SUPER MATRIX (you did'not know it ? Did you ?...)">
+
+    <transition id="0" date="1629830000" author="Jean Sirmai" probability="1">   <!-- moves a dimer to east-->
+      <state id="initial transition state" date="0" author="Jean Sirmai">
+        <arrow x="0" y="0" z="0" site="1" weight="1"/>
+        <arrow x="1" y="0" z="0" site="0" weight="1"/>      <!-- a dimer is identified-->
+                                                            <!-- the local space origin is its "west" particule-->
+        <arrow x="2" y="0" z="0" site="1" weight="0"/>      <!-- the east location next this dimer is empty-->
+        <arrow x="3" y="0" z="0" site="0" weight="0"/>      <!-- In this very simple model, I do not need to check this condition-->
+
+      </state>
+
+      <state id="final transition state" date="0" author="Jean Sirmai">                                                <!-- Therefore I can (and I want to) move it to its next east location-->
+        <arrow x="0" y="0" z="0" site="1" weight="0"/>
+        <arrow x="1" y="0" z="0" site="0" weight="0"/>      <!-- The identified dimer no more exists  ( :-(( -->
+        <arrow x="1" y="0" z="0" site="1" weight="1"/>
+        <arrow x="2" y="0" z="0" site="0" weight="1"/>      <!-- Happily, it is now rebuilt at its east location  ( ;-))-->
+
+      </state>
+
+    </transition>
+
+
+    </transitions>
+
     <ref></ref>
+
     <quote></quote>
+
 </gem-graph-model>
diff --git a/debian/var/models/XMLSchema example (in progress) b/debian/var/models/XMLSchema example (in progress)
index 2d4e83e..2fbc030 100644
--- a/debian/var/models/XMLSchema example (in progress)	
+++ b/debian/var/models/XMLSchema example (in progress)	
@@ -8,12 +8,15 @@
 <xs:attribute name="id" type="xs:string"/>
 <xs:attribute name="date" type="xs:integer"/>  <!--TODO  type ? -->
 <xs:attribute name="name" type="xs:string"/>   <!--TODO  pas clair, ce truc... -->
+<xs:attribute name="lang" type="xs:string"/>
 <xs:attribute name="value" type="xs:integer"/> <!--TODO  WARNING: It's an integer !-->
 <xs:attribute name="author" type="xs:string"/>
 <xs:attribute name="version" type="xs:float"/>
 <xs:attribute name="owner_id" type="xs:integer"/>
+<xs:attribute name="probability" type="xs:integer"/>
 
-<xs:element name="arrow">
+<xs:element name="arrow">  <!-- TODO   Consider using 'group' : -->
+<!-- https://www.w3schools.com/xml/schema_complex_indicators.asp -->
     <xs:complexType>
         <xs:attribute name="x" type="xs:integer" default="1"/>
         <xs:attribute name="y" type="xs:integer" default="0"/>
@@ -23,7 +26,8 @@
     </xs:complexType>
 </xs:element>
 
-<xs:element name="state"> <!-- A connex state is an object. -->
+<!-- A state can be connex or not.   A connex state is an object. -->
+<xs:element name="state">
     <xs:complexType>
     <xs:sequence minOccurs="1" maxOccurs="unbounded">
         <xs:element ref="arrow"/>
@@ -34,6 +38,18 @@
     </xs:complexType>
 </xs:element>
 
+<xs:element name="transition">
+    <xs:complexType>
+    <xs:sequence minOccurs="2" maxOccurs="2"> <!-- TODO ... Cannot use 'length' -->
+        <xs:element ref="state"/>
+    </xs:sequence>
+    <xs:attribute ref="id" use="required"/>
+    <xs:attribute ref="date" use="required"/>
+    <xs:attribute ref="author" use="required"/>
+    <xs:attribute ref="probability" use="required"/>
+    </xs:complexType>
+</xs:element>
+
 <xs:element name="gem-graph-model">
 <xs:complexType>
 <xs:sequence>
@@ -146,9 +162,22 @@
           </xs:complexType>
       </xs:element>
 
-      <xs:element name="transitions" type="xs:string"/> 
-      <xs:element name="ref" type="xs:string"/> 
-      <xs:element name="quote" type="xs:string"/> 
+      <xs:element name="transitions">
+          <xs:complexType>
+          <xs:sequence minOccurs="0" maxOccurs="unbounded">
+              <xs:element ref="transition"/>
+          </xs:sequence>
+          <xs:attribute ref="id" use="required"/>
+          <xs:attribute ref="date" use="required"/>
+          <xs:attribute ref="author" use="required"/>
+          </xs:complexType>
+      </xs:element>
+
+
+      <xs:element name="ref" type="xs:string"/>
+
+      <xs:element name="quote" type="xs:string"/>
+
 </xs:sequence>
 </xs:complexType>
 </xs:element>
diff --git a/debian/var/models/example_II.xml b/debian/var/models/example_II.xml
index cda49de..f68f02a 100644
--- a/debian/var/models/example_II.xml
+++ b/debian/var/models/example_II.xml
@@ -62,6 +62,7 @@
 
   <!-- Saved space description (saved states) -->
   <savestates id="test" date="1629830000" author="Jean Sirmai">
+
     <space id="test" date="1629830000" author="Jean Sirmai">
     </space>
 
@@ -95,8 +96,7 @@
   <ref id="Best reference!" date="1629830000" author="Jean Sirmai" lang="fr">
     https://www.a-lec.org
   </ref>
-  <quote id="Best quote" date="1629830000" author="Jean Sirmai" lang="fr">
-    This is a quote.
-  </quote>
+
+  <quote>This is a quote.</quote>
 
 </gem-graph-model>