diff --git a/README.md b/README.md
index ebbfd0bb..39ad96f7 100644
--- a/README.md
+++ b/README.md
@@ -1,9 +1,9 @@
 - [Summary](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/branch/1.1/README.md)
-- [[tutorial v1.1_011] Or a sub family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_011/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_011~1..v1.1_011))
+- [[tutorial v1.1_012] Putting a variable inside of a family or a sub family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_012~1..v1.1_012))
 
-# [tutorial v1.1_012)] Putting a variable inside of a family or a sub family
+# [tutorial v1.1_020)] A variable with type "domainname"
 
-[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_012~1..v1.1_012)
+[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_020~1..v1.1_020)
 
 
 ## Screenshot
@@ -29,7 +29,7 @@ pip install rougail-cli rougail-output-exporter rougail-output-doc rougail-user-
 Then switch to the tutorial page:
 
 ```shell
-git switch --detach v1.1_012
+git switch --detach v1.1_020
 ```
 
 ## Structure
@@ -37,10 +37,10 @@ git switch --detach v1.1_012
 
 
 <p>
-<a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./">.</a><br/>
-	└── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/">firefox</a><br/>
-	    ├── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/00-proxy.yml">00-proxy.yml</a><br/>
-	    └── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/10-manual.yml">10-manual.yml</a><br/>
+<a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./">.</a><br/>
+	└── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/">firefox</a><br/>
+	    ├── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/00-proxy.yml">00-proxy.yml</a><br/>
+	    └── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/10-manual.yml">10-manual.yml</a><br/>
 <br/><br/></p>
 
 Contents of the firefox/10-manual.yml file
@@ -54,7 +54,9 @@ manual:  # Manual proxy configuration
 
   http_proxy:  # HTTP Proxy
 
-    address:  # HTTP address
+    address:
+      description: HTTP address
+      type: domainname
 ...
 
 ```
@@ -79,20 +81,20 @@ rougail -m firefox/ -o doc
 
 
 
-| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
-|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **manual.http_proxy.address**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                     | HTTP address.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
+|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| **manual.http_proxy.address**<br/>[`domainname`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                         | HTTP address.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
 
 ### Let's generate the changelog
 
 ```shell
 rougail -m firefox/ -o doc --doc.contents changelog
 ```
-#### New variable
+#### Modified variable
 
-| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
-|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
-| **manual.http_proxy.address**<br/>[`string`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                     | HTTP address.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
+| Variable&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   | Description&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;   |
+|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| **manual.http_proxy.address**<br/>~~`string`~~ [<ins>`domainname`</ins>](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | HTTP address.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
 
 
 ## User datas
@@ -104,17 +106,24 @@ rougail -m firefox/ -o doc --doc.contents changelog
 
 ```yml
 ---
+manual:
+  http_proxy:
+    address: example.net
 ```
 #### Output
 
 ```shell
 rougail -m firefox/ -u yaml -yf config/01/config.yml
 ```
-<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
-<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
-<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
-<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
-<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
+<pre>╭──────── Caption ────────╮
+│ Variable <span style="color: #ffd700">Default value</span>  │
+│          Modified value │
+╰─────────────────────────╯
+Variables:
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
+<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/01/config.yml"
 </pre>
 ### Example 2
 
@@ -125,22 +134,28 @@ rougail -m firefox/ -u yaml -yf config/01/config.yml
 ---
 manual:
   http_proxy:
-    address: example.net
+    address: 192.168.0.1
 ```
 #### Output
 
 ```shell
 rougail -m firefox/ -u yaml -yf config/02/config.yml
 ```
-<pre>╭──────── Caption ────────╮
-│ Variable <span style="color: #ffd700">Default value</span>  │
-│          Modified value │
-╰─────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
-<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/02/config.yml"
+<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
+<span style="color: #ffff00">┗━━ </span>the value "192.168.0.1" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must not be an IP, it will be ignored when loading from the YAML file "config/02/config.yml"
+<span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
+<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
+</pre>
+#### Output when invalid user datas is an error
+
+```shell
+rougail -m firefox/ -u yaml -yf config/02/config.yml --cli.invalid_user_datas_error
+```
+<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>the value "192.168.0.1" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must not be an IP, it will be ignored when loading from the YAML file "config/02/config.yml"
 </pre>
 ### Example 3
 
@@ -151,8 +166,7 @@ Variables:
 ---
 manual:
   http_proxy:
-    address: example.net
-    port: 3128
+    address: not a valid domain name
 ```
 #### Output
 
@@ -160,17 +174,21 @@ manual:
 rougail -m firefox/ -u yaml -yf config/03/config.yml
 ```
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>variable or family "manual.http_proxy.port" does not exist, it will be ignored when loading from the YAML file "config/03/config.yml"
-╭──────── Caption ────────╮
-│ Variable <span style="color: #ffd700">Default value</span>  │
-│          Modified value │
-╰─────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
-<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/03/config.yml"
+<span style="color: #ffff00">┗━━ </span>the value "not a valid domain name" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must have dot, it will be ignored when loading from the YAML file "config/03/config.yml"
+<span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
+<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
+</pre>
+#### Output when invalid user datas is an error
+
+```shell
+rougail -m firefox/ -u yaml -yf config/03/config.yml --cli.invalid_user_datas_error
+```
+<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>the value "not a valid domain name" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must have dot, it will be ignored when loading from the YAML file "config/03/config.yml"
 </pre>
 
 
-- [[tutorial v1.1_020] A variable with type "domainname"](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_020~1..v1.1_020))
+- [[tutorial v1.1_021] A variable with type's parameters](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_021/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_021~1..v1.1_021))
diff --git a/config/01/config.yml b/config/01/config.yml
index ed97d539..22422a2f 100644
--- a/config/01/config.yml
+++ b/config/01/config.yml
@@ -1 +1,4 @@
 ---
+manual:
+  http_proxy:
+    address: example.net
diff --git a/config/01/output_ro.html b/config/01/output_ro.html
index ec666c15..d298e7b1 100644
--- a/config/01/output_ro.html
+++ b/config/01/output_ro.html
@@ -1,6 +1,10 @@
-<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
-<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
-<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
-<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
-<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
+<pre>╭──────── Caption ────────╮
+│ Variable <span style="color: #ffd700">Default value</span>  │
+│          Modified value │
+╰─────────────────────────╯
+Variables:
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
+<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/01/config.yml"
 </pre>
diff --git a/config/02/cmd_invalid.txt b/config/02/cmd_invalid.txt
new file mode 100644
index 00000000..0bbf6053
--- /dev/null
+++ b/config/02/cmd_invalid.txt
@@ -0,0 +1 @@
+rougail -m firefox/ -u yaml -yf config/02/config.yml --cli.invalid_user_datas_error
\ No newline at end of file
diff --git a/config/02/config.yml b/config/02/config.yml
index 22422a2f..cbc99036 100644
--- a/config/02/config.yml
+++ b/config/02/config.yml
@@ -1,4 +1,4 @@
 ---
 manual:
   http_proxy:
-    address: example.net
+    address: 192.168.0.1
diff --git a/config/02/output_invalid.html b/config/02/output_invalid.html
new file mode 100644
index 00000000..1522c120
--- /dev/null
+++ b/config/02/output_invalid.html
@@ -0,0 +1,3 @@
+<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>the value "192.168.0.1" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must not be an IP, it will be ignored when loading from the YAML file "config/02/config.yml"
+</pre>
diff --git a/config/02/output_ro.html b/config/02/output_ro.html
index a0d9438c..7619b3bb 100644
--- a/config/02/output_ro.html
+++ b/config/02/output_ro.html
@@ -1,10 +1,8 @@
-<pre>╭──────── Caption ────────╮
-│ Variable <span style="color: #ffd700">Default value</span>  │
-│          Modified value │
-╰─────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
-<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/02/config.yml"
+<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
+<span style="color: #ffff00">┗━━ </span>the value "192.168.0.1" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must not be an IP, it will be ignored when loading from the YAML file "config/02/config.yml"
+<span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
+<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
 </pre>
diff --git a/config/03/cmd_invalid.txt b/config/03/cmd_invalid.txt
new file mode 100644
index 00000000..ffde9149
--- /dev/null
+++ b/config/03/cmd_invalid.txt
@@ -0,0 +1 @@
+rougail -m firefox/ -u yaml -yf config/03/config.yml --cli.invalid_user_datas_error
\ No newline at end of file
diff --git a/config/03/config.yml b/config/03/config.yml
index da3353ac..bdc052ca 100644
--- a/config/03/config.yml
+++ b/config/03/config.yml
@@ -1,5 +1,4 @@
 ---
 manual:
   http_proxy:
-    address: example.net
-    port: 3128
+    address: not a valid domain name
diff --git a/config/03/output_invalid.html b/config/03/output_invalid.html
new file mode 100644
index 00000000..f04dbb17
--- /dev/null
+++ b/config/03/output_invalid.html
@@ -0,0 +1,3 @@
+<pre><span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>the value "not a valid domain name" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must have dot, it will be ignored when loading from the YAML file "config/03/config.yml"
+</pre>
diff --git a/config/03/output_ro.html b/config/03/output_ro.html
index de915a0e..00845602 100644
--- a/config/03/output_ro.html
+++ b/config/03/output_ro.html
@@ -1,12 +1,8 @@
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>variable or family "manual.http_proxy.port" does not exist, it will be ignored when loading from the YAML file "config/03/config.yml"
-╭──────── Caption ────────╮
-│ Variable <span style="color: #ffd700">Default value</span>  │
-│          Modified value │
-╰─────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: <span style="color: #ffd700">No proxy</span>
-<span style="color: #5c5cff">┗━━ </span>📂 Manual proxy configuration
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📂 HTTP Proxy
-<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP address: example.net ◀ loaded from the YAML file "config/03/config.yml"
+<span style="color: #ffff00">┗━━ </span>the value "not a valid domain name" is an invalid domain name for "manual.http_proxy.address" (HTTP address), must have dot, it will be ignored when loading from the YAML file "config/03/config.yml"
+<span style="font-weight: bold; color: #ff0000">🛑 ERRORS</span>
+<span style="color: #ff0000">┗━━ </span>The following variables are mandatory but have no value:
+<span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>Manual proxy configuration
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP Proxy
+<span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">    </span><span style="color: #ff0000">┗━━ </span>HTTP address
 </pre>
diff --git a/tree.html b/tree.html
index a454d685..a20586c6 100644
--- a/tree.html
+++ b/tree.html
@@ -25,10 +25,10 @@
 </head>
 <body>
 	<h1>Directory Tree</h1><p>
-	<a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./">.</a><br>
-	└── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/">firefox</a><br>
-	&nbsp;&nbsp;&nbsp; ├── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/00-proxy.yml">00-proxy.yml</a><br>
-	&nbsp;&nbsp;&nbsp; └── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_012/./firefox/10-manual.yml">10-manual.yml</a><br>
+	<a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./">.</a><br>
+	└── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/">firefox</a><br>
+	&nbsp;&nbsp;&nbsp; ├── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/00-proxy.yml">00-proxy.yml</a><br>
+	&nbsp;&nbsp;&nbsp; └── <a href="https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_020/./firefox/10-manual.yml">10-manual.yml</a><br>
 <br><br><p>
 
 2 directories, 2 files