preliminary file ok

docs/tutorial/preliminary.rst

@@ -190,9 +190,9 @@ Let's add a default value to this `proxy_mode` variable.
 
 .. admonition:: how to set a value -- the assignment
 
-    A default value has been set, great. This raises a question about what a normal value is.
+    A default value has been set, great. This raises the question of what constitutes a value other than a default value.
 
-    Now then how can I assign a normal value to a variable?
+    How can I assign a value to a variable?
 
 .. type-along:: The different rougail roles and the default values
 
@@ -239,7 +239,7 @@ he is responsible of other files called the :term:`user data file`\ s.
 
 .. exercise:: Folder structure update
 
-    Now we add a :file:`config/config.yaml` file in our project::
+    Now we add a :file:`config/config.yaml` file, the :file:`config` folder is where we will place the user datas::
 
         rougail-tutorials
         ├── firefox
@@ -261,9 +261,10 @@ it's up to the operator to do the job in the `config.yaml` file:
     ---
     proxy_mode: No proxy
 
-:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_001/config/02/config.yaml>`
+:tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_003/config/02/config.yml>`
 
-With the rougail CLI the operator has to add the `-u yaml -ff config/config.yaml` options: 
+If you want the user datas to be taken into account, you must provide the `-u yaml -ff config/config.yaml` options
+to the rougail CLI: 
 
 .. code-block:: text
    :class: terminal
@@ -285,6 +286,8 @@ which gives us this output:
     <span style="color: #5c5cff">┗━━ </span>📓 proxy_mode: No proxy ◀ loaded from the YAML file "config/02/config.yaml"
     </pre>
 
+We can see in the output result that the :file:`config/02/config.yml` user data file has been taken into account.
+
 .. admonition:: Important fact
 
     - the integrator works on structure files
@@ -292,16 +295,26 @@ which gives us this output:
     
 Most of the time, the integrator and the operator are one and the same person, here we are talking about roles and not necessarily about people.    
 
-.. type-along:: Defining a choice type
+Limits the possible values for the variable
+-------------------------------------------------
 
-In our firefox use case, the real type of the `proxy_mode` variable will be now set as a  `choice` type:
+.. type-along:: For those who follow the tutorial with the help of the git repository
 
-.. seealso:: Have a look at the definition of the :term:`choice type variable <choice type>`
+    Now you need to checkout the `v1.1_004` version::
+     
+          git checkout v1.1_004
+
+In our firefox use case, we can see that we have different possibilites available for the `proxy_mode` variable values:
+
+
+.. image:: images/proxy_choices.png
+
+Let's insert these different possible choices with a `choice` variable's property here:
 
 .. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/tag/v1.1_004/firefox/00-proxy.yml
    :linenos:
    :language: yaml
-   :caption: The real :file:`firefox/proxy.yml` Rougail structure file with a choice type
+   :caption: The real :file:`firefox/proxy.yml` Rougail structure file with different possible choices
    :name: RougailDictionaryChoiceType
 
 ..
@@ -318,7 +331,7 @@ In our firefox use case, the real type of the `proxy_mode` variable will be now
 
 :tutorial:`Download this file from the rougail-tutorials git repository <src/tag/v1.1_004/firefox/00-proxy.yml>`
 
-- Let's run the Rougail CLI 
+- Let's run the Rougail CLI now:
 
 .. code-block:: text
    :class: terminal
@@ -344,13 +357,14 @@ We have an output like this one:
 
 The `proxy_mode` variable here, implicitely requires a value. It is a :term:`mandatory` variable.
 
-As we set the `proxy_mode` variable as `No proxy` by default, we actually have specified a value, and the value appears in yellow, which means : "set by default". 
+As we set the `proxy_mode` variable as `No proxy` by default, we actually have specified a value, 
+and the value appears in yellow, which means : "set by default". 
 
-The constraints that come with the `choice` type
+.. todo:: ajouter une sortie qui montre que la valeur provient du user data file.
-----------------------------------------------------
 
-We say that the `proxy_mode` variable is *constrained* (by the `choice` type).
+.. type-along:: The constraints that come with the `choice` property
 
+The `proxy_mode` variable's possible values is *constrained*.
 We have the list of the possible (authorized) values:
 
 - `No proxy`
@@ -369,11 +383,10 @@ We have the list of the possible (authorized) values:
     - :term:`structure file <structure file>`: structure description file
     - :term:`variable`: an option's name which has a value
     - a variable's description
-    - a variable's type
     - a variable's default value
     - the :term:`integrator` and :term:`operator` roles
     - a mandatory value
-    - a choice type
+    - the possibility to constrain the possible values of a variable
 
     **Progress**