diff --git a/README.md b/README.md
index f79e116f..f79bd958 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_025] A variable with type "port"](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_025/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_025~1..v1.1_025))
+- [[tutorial v1.1_026] A disabled family](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_026/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_026~1..v1.1_026))
 
-# [tutorial v1.1_026)] A disabled family
+# [tutorial v1.1_027)] A conditional disabled family with a variable
 
-[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_026~1..v1.1_026)
+[View the diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_027~1..v1.1_027)
 
 
 ## Screenshot
@@ -45,7 +45,9 @@ version: 1.1
 
 manual:
   description: Manual proxy configuration
-  disabled: true
+  disabled:
+    variable: _.proxy_mode
+    when_not: Manual proxy configuration
 
   http_proxy:  # HTTP Proxy
 
@@ -65,24 +67,46 @@ manual:
 ### Let's generate the documentation
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -o doc -do github
 ```
 | Variable                                                                                          | Description                                                                                       |
 |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | **proxy_mode**<br/>[`choice`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                    | Configure Proxy Access to the Internet.<br/>**Choices**: <br/>- No proxy **← (default)**<br/>- Auto-detect proxy settings for this network<br/>- Use system proxy settings<br/>- Manual proxy configuration<br/>- Automatic proxy configuration URL                                                                                                                                                                                                                                                                                   |
 
+#### Manual proxy configuration
+
+**manual**
+
+*`disabled`*
+
+**Disabled**: when the variable "proxy_mode" hasn't the value "Manual proxy configuration"
+
+##### HTTP Proxy
+
+**manual.http_proxy**
+
+
+
+| 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.<br/>**Validator**: the domain name can be an IP                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+| **manual.http_proxy.port**<br/>[`port`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                  | HTTP Port.<br/>**Validators**: <br/>- well-known ports (1 to 1023) are allowed<br/>- registred ports (1024 to 49151) are allowed<br/>- private ports (greater than 49152) are allowed<br/>**Default**: 8080                                                                                                                                                                                                                                                                                                                                                   |
+
 ### Let's generate the changelog
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -o doc --doc.contents changelog -do github
 ```
-#### Deleted variables
+#### New variables
+
+| 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.<br/>**Validator**: the domain name can be an IP                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
+| **manual.http_proxy.port**<br/>[`port`](https://rougail.readthedocs.io/en/latest/variable.html#variables-types) `mandatory`                                                                                                                                                                                                                                                                                                                                                                                                                                                  | HTTP Port.<br/>**Validators**: <br/>- well-known ports (1 to 1023) are allowed<br/>- registred ports (1024 to 49151) are allowed<br/>- private ports (greater than 49152) are allowed<br/>**Default**: 8080                                                                                                                                                                                                                                                                                                                                                   |
 
 
-- manual.http_proxy.address
-- manual.http_proxy.port
 ## User datas
 
 ### Example 1
@@ -97,7 +121,7 @@ foo@bar:~$ rougail -m firefox/ -o doc --doc.contents changelog -do github
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/01/config.yaml
 ```
 <pre>╭─────── Caption ────────╮
@@ -109,7 +133,7 @@ Variables:
 #### Output in read write mode
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/01/config.yaml --cli.read_write
 ```
 <pre>╭─────── Caption ────────╮
@@ -131,28 +155,26 @@ proxy_mode: Manual proxy configuration
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/02/config.yaml
 ```
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/02/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<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>
 #### Output in read write mode
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/02/config.yaml --cli.read_write
 ```
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/02/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<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>
 ### Example 3
 
@@ -170,32 +192,38 @@ manual:
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/03/config.yaml
 ```
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/03/config.yaml"
-╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
+<pre>╭────────────── Caption ───────────────╮
+│ Variable <span style="color: #ffd700">Default value</span>               │
+│          Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">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.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: <span style="color: #ffd700">8080</span>
 </pre>
 #### Output in read write mode
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/03/config.yaml --cli.read_write
 ```
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/03/config.yaml"
-╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
+<pre>╭────────────── Caption ───────────────╮
+│ Variable <span style="color: #ffd700">Default value</span>               │
+│          Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">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.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: <span style="color: #ffd700">8080</span>
 </pre>
 ### Example 4
 
@@ -214,34 +242,36 @@ manual:
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/04/config.yaml
 ```
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/04/config.yaml"
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/04/config.yaml"
-╭────────────── Caption ───────────────╮
+<pre>╭────────────── Caption ───────────────╮
 │ Variable Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">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/04/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
 #### Output in read write mode
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/04/config.yaml --cli.read_write
 ```
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/04/config.yaml"
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/04/config.yaml"
-╭────────────── Caption ───────────────╮
+<pre>╭────────────── Caption ───────────────╮
 │ Variable Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">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/04/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
 ### Example 5
 
@@ -263,12 +293,10 @@ manual:
 #### Output
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/05/config.yaml
 ```
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/05/config.yaml"
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┣━━ </span>variable or family "manual.use_for_https" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┗━━ </span>variable or family "manual.https_proxy" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭────────────── Caption ───────────────╮
@@ -276,17 +304,19 @@ foo@bar:~$ rougail -m firefox/ -u yaml -ff config/05/config.yaml
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">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: http.proxy.net ◀ loaded from the YAML file "config/05/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
 #### Output in read write mode
 
 ```console
-foo@bar:~$ git switch --detach v1.1_026
+foo@bar:~$ git switch --detach v1.1_027
 foo@bar:~$ rougail -m firefox/ -u yaml -ff config/05/config.yaml --cli.read_write
 ```
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/05/config.yaml"
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┣━━ </span>variable or family "manual.use_for_https" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┗━━ </span>variable or family "manual.https_proxy" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭────────────── Caption ───────────────╮
@@ -294,8 +324,12 @@ foo@bar:~$ rougail -m firefox/ -u yaml -ff config/05/config.yaml --cli.read_writ
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">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: http.proxy.net ◀ loaded from the YAML file "config/05/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
 
 
-- [[tutorial v1.1_027] A conditional disabled family with a variable](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_027/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_027~1..v1.1_027))
+- [[tutorial v1.1_030] A variable with type "boolean"](https://forge.cloud.silique.fr/stove/rougail-tutorials/src/commit/v1.1_030/README.md) ([diff](https://forge.cloud.silique.fr/stove/rougail-tutorials/compare/v1.1_030~1..v1.1_030))
diff --git a/config/02/output_ro.html b/config/02/output_ro.html
index 43e8b965..ec666c15 100644
--- a/config/02/output_ro.html
+++ b/config/02/output_ro.html
@@ -1,7 +1,6 @@
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/02/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<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>
diff --git a/config/02/output_rw.html b/config/02/output_rw.html
index 43e8b965..ec666c15 100644
--- a/config/02/output_rw.html
+++ b/config/02/output_rw.html
@@ -1,7 +1,6 @@
-<pre>╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
-│          (<span style="color: #00aa00">⏳ Original default value</span>) │
-╰──────────────────────────────────────╯
-Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/02/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<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>
diff --git a/config/03/output_ro.html b/config/03/output_ro.html
index 9fb4d886..f89e24f4 100644
--- a/config/03/output_ro.html
+++ b/config/03/output_ro.html
@@ -1,9 +1,12 @@
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/03/config.yaml"
-╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
+<pre>╭────────────── Caption ───────────────╮
+│ Variable <span style="color: #ffd700">Default value</span>               │
+│          Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">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.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: <span style="color: #ffd700">8080</span>
 </pre>
diff --git a/config/03/output_rw.html b/config/03/output_rw.html
index 9fb4d886..f89e24f4 100644
--- a/config/03/output_rw.html
+++ b/config/03/output_rw.html
@@ -1,9 +1,12 @@
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/03/config.yaml"
-╭────────────── Caption ───────────────╮
-│ Variable Modified value              │
+<pre>╭────────────── Caption ───────────────╮
+│ Variable <span style="color: #ffd700">Default value</span>               │
+│          Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/03/config.yaml" (⏳ <span style="color: #00aa00">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.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: <span style="color: #ffd700">8080</span>
 </pre>
diff --git a/config/04/output_ro.html b/config/04/output_ro.html
index e654b746..4d0ae5a0 100644
--- a/config/04/output_ro.html
+++ b/config/04/output_ro.html
@@ -1,10 +1,11 @@
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/04/config.yaml"
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/04/config.yaml"
-╭────────────── Caption ───────────────╮
+<pre>╭────────────── Caption ───────────────╮
 │ Variable Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">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/04/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
diff --git a/config/04/output_rw.html b/config/04/output_rw.html
index e654b746..4d0ae5a0 100644
--- a/config/04/output_rw.html
+++ b/config/04/output_rw.html
@@ -1,10 +1,11 @@
-<pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/04/config.yaml"
-<span style="color: #ffff00">┗━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/04/config.yaml"
-╭────────────── Caption ───────────────╮
+<pre>╭────────────── Caption ───────────────╮
 │ Variable Modified value              │
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">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/04/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/04/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
diff --git a/config/05/output_ro.html b/config/05/output_ro.html
index 10922d4a..0438b8ae 100644
--- a/config/05/output_ro.html
+++ b/config/05/output_ro.html
@@ -1,6 +1,4 @@
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/05/config.yaml"
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┣━━ </span>variable or family "manual.use_for_https" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┗━━ </span>variable or family "manual.https_proxy" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭────────────── Caption ───────────────╮
@@ -8,5 +6,9 @@
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">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: http.proxy.net ◀ loaded from the YAML file "config/05/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>
diff --git a/config/05/output_rw.html b/config/05/output_rw.html
index 10922d4a..0438b8ae 100644
--- a/config/05/output_rw.html
+++ b/config/05/output_rw.html
@@ -1,6 +1,4 @@
 <pre><span style="font-weight: bold; color: #ffff00">🔔 WARNINGS</span>
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.address" (HTTP address) will be ignored when loading from the YAML file "config/05/config.yaml"
-<span style="color: #ffff00">┣━━ </span>family "manual" (Manual proxy configuration) is disabled, "manual.http_proxy.port" (HTTP Port) will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┣━━ </span>variable or family "manual.use_for_https" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 <span style="color: #ffff00">┗━━ </span>variable or family "manual.https_proxy" does not exist, it will be ignored when loading from the YAML file "config/05/config.yaml"
 ╭────────────── Caption ───────────────╮
@@ -8,5 +6,9 @@
 │          (<span style="color: #00aa00">⏳ Original default value</span>) │
 ╰──────────────────────────────────────╯
 Variables:
-<span style="color: #5c5cff">┗━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">No proxy</span>)
+<span style="color: #5c5cff">┣━━ </span>📓 Configure Proxy Access to the Internet: Manual proxy configuration ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">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: http.proxy.net ◀ loaded from the YAML file "config/05/config.yaml"
+<span style="color: #5c5cff">    </span><span style="color: #5c5cff">    </span><span style="color: #5c5cff">┗━━ </span>📓 HTTP Port: 3128 ◀ loaded from the YAML file "config/05/config.yaml" (⏳ <span style="color: #00aa00">8080</span>)
 </pre>