diff --git a/debian/var/models/XML model example (in progress) b/debian/var/models/XML model example (in progress)
index 91cb322..0a6b1d5 100644
--- a/debian/var/models/XML model example (in progress)	
+++ b/debian/var/models/XML model example (in progress)	
@@ -4,7 +4,7 @@
     <identity>
        <anything_but_not_just_the_word_name>Modèle de test</anything_but_not_just_the_word_name>
        <name value="(Trois dimères)"/>
-       <owner_id>2</owner_id>
+       <owner>2</owner>
        <date>1629830000</date>
        <version>1.0</version>
     </identity>
@@ -42,7 +42,7 @@
             <arrow x="1" y="0" z="0" site="0" weight="3"/>
         </state>
 
-        <!-- Just for the fun !  Can you imagine some rules in a next model ? -->
+        <!-- Just for the fun !  Can you imagine adequate rules in a next model ? -->
         <state id="dimer 1-2" date="1629830000" author="Jean Sirmai">
             <arrow x="0" y="0" z="0" site="1" weight="1"/>
             <arrow x="1" y="0" z="0" site="0" weight="2"/>
diff --git a/debian/var/models/XMLSchema example (in progress) b/debian/var/models/XMLSchema example (in progress)
index 2fbc030..e1d5c93 100644
--- a/debian/var/models/XMLSchema example (in progress)	
+++ b/debian/var/models/XMLSchema example (in progress)	
@@ -1,20 +1,40 @@
 <?xml version="1.0"?>
 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
 
+<!-- https://www.freeformatter.com/xml-validator-xsd.html -->
 <!-- https://www.w3schools.com/xml/el_attribute.asp  -->
 <!-- use="required" is NOT allowed in attributes declarations-->
-<!-- Attribute 'name' Cannot Appear In Element 'element'.-->
+<!-- To know : Attribute 'name' Cannot Appear In Element 'element'.-->
+
+<!-- TODO
+      <BALISE>texte</BALISE> doit toujours être équivalent à <BALISE value="texte"/>
+      quelle que soit la BALISE et quel que soit le texte.
+      (excepté pour certaines balises sans texte)
+
+      Les balises concernées sont :
+      name, owner, date, version, max_thread, max_cycles,
+      dimension, site_multiplicity, boundaries, ref et quote
+
+      Comment déclarer cette équivalence ? -->
+
+<!-- xs:element name="name" type="xs:string"/ -->
 
 <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="name" type="xs:string"/>
 <xs:attribute name="lang" type="xs:string"/>
 <xs:attribute name="value" type="xs:integer"/> <!--TODO  WARNING: It's an integer !-->
+<xs:attribute name="owner" type="xs: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"/>
 
+<!-- TO EVALUATE   Consider using 'group' (?) or NOT -->
+<!-- https://www.w3schools.com/xml/schema_complex_indicators.asp -->
+<!-- TO EVALUATE   Other definitions of an arrow (coord origin + dest,...) -->
+<!-- TO EVALUATE   Hypercubes pave the space => add a potential dimension 'w':
+     <xs:attribute name="w" type="xs:integer" default="0"/>-->
+
 <xs:element name="arrow">  <!-- TODO   Consider using 'group' : -->
 <!-- https://www.w3schools.com/xml/schema_complex_indicators.asp -->
     <xs:complexType>
@@ -26,7 +46,16 @@
     </xs:complexType>
 </xs:element>
 
-<!-- A state can be connex or not.   A connex state is an object. -->
+<!-- A state can be connex or not.   A connex state is an object.
+     A transition goes from an origin (state) to a target.
+
+     Therefore, element 'State' is used in
+     - objects definitions,
+     - initial and produced/computed states declarations,
+     - origin and target declarations of a transition.
+
+     What attributes should always be associated to a state ? -->
+
 <xs:element name="state">
     <xs:complexType>
     <xs:sequence minOccurs="1" maxOccurs="unbounded">
@@ -66,7 +95,7 @@
                 </xs:complexType>
             </xs:element>
 
-            <xs:element name="owner_id" type="xs:integer"/>
+            <xs:element name="owner" type="xs:integer"/>
             <xs:element name="date" type="xs:integer"/>
             <xs:element name="version" type="xs:float"/>