diff --git a/docs/library/index.rst b/docs/library/index.rst
index 66cc7fced..eb3ce2e18 100644
--- a/docs/library/index.rst
+++ b/docs/library/index.rst
@@ -73,6 +73,8 @@ The Rougail CLI can output a rather complete view of the dataset:
    :titlesonly:
    :caption: Use library
 
+   user_datas
+   output
    parse
    tags
    rougailconfig_load_from_cli
diff --git a/docs/library/output.rst b/docs/library/output.rst
new file mode 100644
index 000000000..2a49d5178
--- /dev/null
+++ b/docs/library/output.rst
@@ -0,0 +1,144 @@
+Display the result
+==================
+
+After construct a configuration, loads user datas, you can choose this configuration in different output format.
+
+First of create, let's create a structural file like this:
+
+.. code-block:: yaml
+   :caption: the :file:`dist/00-base.yml` file content
+
+    %YAML 1.2
+    ---
+    version: 1.1
+
+    my_variable: my value   # My first variable
+
+    my_boolean_variable: true  # My boolean variable
+
+    my_integer_variable: 1  # My integer variable
+
+    my_secret_variable:
+      description: My secret variable
+      type: secret
+      default: MyVeryStrongPassword
+    ...
+
+Display in a console
+--------------------
+
+We can display configuration directly in the console:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.output_console import RougailOutputConsole
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.output"] = "console"
+    rougail = Rougail(RougailConfig)
+    config = rougail.run()
+    config.property.read_only()
+    RougailOutputConsole(config).print()
+
+FIXME display console!
+
+console.key_is_description
+''''''''''''''''''''''''''
+
+By default, the key is the variable description, if you prefer have only the path:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.output_json import RougailOutputJson
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.output"] = "json"
+    rougail = Rougail(RougailConfig)
+    config = rougail.run()
+    config.property.read_only()
+    RougailOutputJson(config).print()
+
+
+FIXME display console!
+
+console.show_secrets
+''''''''''''''''''''
+
+Secrets are remplace by "*******", to display real secrets:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.output_console import RougailOutputConsole
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["console.show_secrets"] = True
+    rougail = Rougail(RougailConfig)
+    config = rougail.run()
+    config.property.read_only()
+    RougailOutputConsole(config).print()
+
+FIXME display console!
+
+console.mandatory
+'''''''''''''''''
+
+Before display configuration, mandatories variables are check. If you don't want, add the parameter `console.mandatory` to False:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.output_console import RougailOutputConsole
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["console.mandatory"] = False
+    rougail = Rougail(RougailConfig)
+    config = rougail.run()
+    config.property.read_only()
+    RougailOutputConsole(config).print()
+
+FIXME display console!
+
+JSON
+----
+
+Your script can return a JSON object:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.output_console import RougailOutputConsole
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["console.mandatory"] = False
+    rougail = Rougail(RougailConfig)
+    config = rougail.run()
+    config.property.read_only()
+    RougailOutputConsole(config).print()
+
+Let's try this script:
+
+.. code-block:: bash
+
+    $ LC_ALL=C python script.py
+    {
+      "my_variable": "my value",
+      "my_boolean_variable": true,
+      "my_integer_variable": 1,
+      "my_secret_variable": "MyVeryStrongPassword"
+    }
+
+
+.. doc,ansible
diff --git a/docs/library/parse.rst b/docs/library/parse.rst
index 15da9e475..ee091b61e 100644
--- a/docs/library/parse.rst
+++ b/docs/library/parse.rst
@@ -12,7 +12,7 @@ First of all, create our structural file:
 
     %YAML 1.2
     ---
-    version: 1.1  
+    version: 1.1
 
     my_variable:  # a simple variable
       - value1
@@ -43,17 +43,17 @@ Create our first script to walk through our config:
     :caption: the :file:`script.py` file content
 
     from rougail import Rougail, RougailConfig
-    
+
     RougailConfig['main_structural_directories'] = ['dist']
     rougail = Rougail()
     config = rougail.run()
-    
+
     def walk(config):
         for option in config:
             print(option.description())
             if option.isoptiondescription():
                 walk(option)
-    
+
     if __name__ == '__main__':
         walk(config)
 
@@ -61,7 +61,7 @@ Let's execute `script.py`:
 
 .. code-block:: bash
 
-    $ python3 script.py 
+    $ python3 script.py
     rougail
     rougail.my_variable (a simple variable)
     rougail.a_family (a simple family)
@@ -84,11 +84,11 @@ Let us distinguish the variables of the families
     :caption: the :file:`script.py` file content
 
     from rougail import Rougail, RougailConfig
-    
+
     RougailConfig['main_structural_directories'] = ['dist']
     rougail = Rougail()
     config = rougail.run()
-    
+
     def walk(config, level=0):
         for option in config:
             if option.isoptiondescription():
@@ -99,7 +99,7 @@ Let us distinguish the variables of the families
             print(f"{prefix}{typ}: {option.description()}")
             if option.isoptiondescription():
                 walk(option, level + 1)
-    
+
     if __name__ == '__main__':
         walk(config)
 
@@ -107,6 +107,7 @@ Let's execute `script.py`:
 
 .. code-block:: bash
 
+    $ python3 script.py
     family: rougail
       variable: rougail.my_variable (a simple variable)
       family: rougail.a_family (a simple family)
diff --git a/docs/library/user_datas.rst b/docs/library/user_datas.rst
new file mode 100644
index 000000000..5e8d1daca
--- /dev/null
+++ b/docs/library/user_datas.rst
@@ -0,0 +1,393 @@
+Load user datas
+===============
+
+User datas are values setup but user for configuration variables.
+
+There is differents types of user datas for differents sources types.
+
+We can cumulate user datas loader.
+
+For this section, we will use :file:`dict/00-base.yml` a structure file:
+
+.. code-block:: yaml
+
+    %YAML 1.2
+    ---
+    version: 1.1
+
+    my_variable: my value   # My first variable
+
+    my_boolean_variable: true  # My boolean variable
+
+    my_integer_variable: 1  # My integer variable
+
+    my_secret_variable:
+      description: My secret variable
+      type: secret
+
+    my_hidden_variable:
+      description: My hidden variable
+      hidden: true
+    ...
+
+Here is the first script which is load this file:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    rougail = Rougail()
+    config = rougail.run()
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    $ python3 script.py 
+    {<TiramisuOption path="my_variable">: 'my value', <TiramisuOption path="my_boolean_variable">: True, <TiramisuOption path="my_integer_variable">: 1, <TiramisuOption path="my_secret_variable">: None}
+
+YAML
+----
+
+We want to load this YAML file with value define by user:
+
+.. code-block:: yaml
+
+    ---
+    my_variable: a new value
+
+    my_boolean_variable: false
+
+    my_integer_variable: 10
+
+    my_secret_variable: MyVeryStrongPassword
+
+Here is the script which is load user data from the YAML file:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_yaml import RougailUserDataYaml
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["yaml"]
+    RougailConfig["yaml.filename"] = ["dist.yml"]
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataYaml(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    $ python3 script.py 
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+Set a secret in clear text file is not always a good idea.
+This is why the `yaml.file_with_secrets` parameter allows you to define whether files define in `yaml.filename` can contain a secret and which one:
+
+- all: all file can contains secret
+- first: only the first file can contains secret
+- last: only the last file can contains secret
+- none: no file can contains secret
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_yaml import RougailUserDataYaml
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["yaml"]
+    RougailConfig["yaml.filename"] = ["dist.yml"]
+    RougailConfig["yaml.file_with_secrets"] = "none"
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataYaml(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    $ python3 script.py 
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: None}
+
+Environment variables
+---------------------
+
+We can define use data from environment variables. The environment name is a "prefix" (ROUGAIL by default) with "_" and variable name in uppercase format.
+
+For example:
+- my_variable has ROUGAIL_MY_VARIABLE as a environment variable name
+- my_family.my_variable has ROUGAIL_MY_FAMILY.MY_VARIABLE as a environment variable name
+
+Some shell doesn't allow dot in environment file. In this case use the command "env".
+
+For example: `env ROUGAIL_MY_FAMILY.MY_VARIABLE="value" ./script.py`.
+
+Here is the script:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment"]
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataEnvironment(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    env ROUGAIL_MY_VARIABLE="a new value" ROUGAIL_MY_BOOLEAN_VARIABLE="False" ROUGAIL_MY_INTEGER_VARIABLE=10 ROUGAIL_MY_SECRET_VARIABLE="MyVeryStrongPassword" python script.py
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+We can redefine the prefix with `environment.default_environment_name` (prefix is always uppercase characters):
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment"]
+    RougailConfig["environment.default_environment_name"] = "EX"
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataEnvironment(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    env EX_MY_VARIABLE="a new value" EX_MY_BOOLEAN_VARIABLE="False" EX_MY_INTEGER_VARIABLE=10 EX_MY_SECRET_VARIABLE="MyVeryStrongPassword" python script.py
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+If you define a `main_namespace` or `extra_namespace`, the `environment.default_environment_name` is automaticly define with the name of the namespace in uppercase. And the separator is no more "_" but ".":
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+
+    RougailConfig["main_namespace"] = "main"
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment"]
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataEnvironment(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    env MAIN.MY_VARIABLE="a new value" MAIN.MY_BOOLEAN_VARIABLE="False" MAIN.MY_INTEGER_VARIABLE=10 MAIN.MY_SECRET_VARIABLE="MyVeryStrongPassword" python script.py
+    {<TiramisuOption path="main">: {<TiramisuOption path="main.my_variable">: 'a new value', <TiramisuOption path="main.my_boolean_variable">: False, <TiramisuOption path="main.my_integer_variable">: 10, <TiramisuOption path="main.my_secret_variable">: 'MyVeryStrongPassword'}}
+
+Set a secret in clear variable environment is not always a good idea.
+This is why the `environment.with_secrets` parameter allows you to reject secret from environment variable:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment"]
+    RougailConfig["environment.with_secrets"] = False
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataEnvironment(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py`:
+
+.. code-block:: bash
+
+    env ROUGAIL_MY_VARIABLE="a new value" ROUGAIL_MY_BOOLEAN_VARIABLE="False" ROUGAIL_MY_INTEGER_VARIABLE=10 ROUGAIL_MY_SECRET_VARIABLE="MyVeryStrongPassword" python script.py
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: None}
+
+Comand line parser user data
+----------------------------
+
+Value can be define directly with command line arguments:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_commandline import RougailUserDataCommandline
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["commandline"]
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataCommandline(
+         config,
+    ).run()
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py` to display help:
+
+.. code-block:: bash
+
+    $ python script.py -h
+    usage: script.py [-h] --my_variable [MY_VARIABLE] --my_boolean_variable --no-my_boolean_variable --my_integer_variable [MY_INTEGER_VARIABLE] --my_secret_variable MY_SECRET_VARIABLE
+
+    options:
+      -h, --help            show this help message and exit
+      --my_variable [MY_VARIABLE]
+                            my_variable (My first variable) (default: my value)
+      --my_boolean_variable
+                            my_boolean_variable (My boolean variable) (default: True)
+      --no-my_boolean_variable
+      --my_integer_variable [MY_INTEGER_VARIABLE]
+                            my_integer_variable (My integer variable) (default: 1)
+      --my_secret_variable MY_SECRET_VARIABLE
+                            my_secret_variable (My secret variable)
+    {<TiramisuOption path="my_variable">: 'my value', <TiramisuOption path="my_boolean_variable">: True, <TiramisuOption path="my_integer_variable">: 1, <TiramisuOption path="my_secret_variable">: None}
+
+
+And now with modified value:
+
+.. code-block:: bash
+    $ python script.py --my_variable "a new value" --no-my_boolean_variable --my_integer_variable 10 --my_secret_variable MyVeryStrongPassword
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+Boolean variable has a special behavour. To set False you need to add --no-VARIABLE, to set True you need to add --VARIABLE parameter.
+
+.. ansible,bitwarden,questionary
+
+Combine user datas
+------------------
+
+You can combine user datas, for example if you want to load datas from environment and/or command line argument:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+    from rougail.user_data_commandline import RougailUserDataCommandline
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment", "commandline"]
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = []
+    user_datas.extend(RougailUserDataEnvironment(
+         config,
+    ).run())
+    user_datas.extend(RougailUserDataCommandline(
+         config,
+    ).run())
+    rougail.user_datas(user_datas)
+    print(config.value.get())
+
+Let's execute `script.py` with environment variable and commandline arguments:
+
+.. code-block:: bash
+    $ env ROUGAIL_MY_VARIABLE="a new value" ROUGAIL_MY_BOOLEAN_VARIABLE="False" python script.py --my_integer_variable 10 --my_secret_variable MyVeryStrongPassword
+    {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+If the value of a variable is define with an environment variable and commandline argument, the value is the value of the last user data define:
+
+.. code-block:: bash
+    $ env ROUGAIL_MY_VARIABLE="not a new" python script.py --my_variable "a new value" --no-my_boolean_variable --my_integer_variable 10 --my_secret_variable MyVeryStrongPassword
+   {<TiramisuOption path="my_variable">: 'a new value', <TiramisuOption path="my_boolean_variable">: False, <TiramisuOption path="my_integer_variable">: 10, <TiramisuOption path="my_secret_variable">: 'MyVeryStrongPassword'}
+
+Manage errors and warnings
+--------------------------
+
+Recreate a script with environnement variable support which is display the return of user_datas function:
+
+.. code-block:: python
+    :caption: the :file:`script.py` file content
+
+    from rougail import Rougail, RougailConfig
+    from rougail.user_data_environment import RougailUserDataEnvironment
+
+    RougailConfig["main_namespace"] = None
+    RougailConfig["main_structural_directories"] = ["dist"]
+    RougailConfig["step.user_data"] = ["environment"]
+    RougailConfig["environment.with_secrets"] = False
+    rougail = Rougail()
+    config = rougail.run()
+
+    user_datas = RougailUserDataEnvironment(
+         config,
+    ).run()
+    print(rougail.user_datas(user_datas))
+
+Try to load the value an unknown variable:
+
+.. code-block:: bash
+    $ LC_ALL=C env ROUGAIL_UNKNOWN_VARIABLE="a value" python script.py
+    {'errors': [], 'warnings': ['variable or family "unknown_variable" does not exist, it will be ignored when loading from environment variable']}
+
+As you can see, a warnings is return.
+
+Try to load the value of an hidden variable:
+
+.. code-block:: bash
+   $ LC_ALL=C env ROUGAIL_MY_HIDDEN_VARIABLE="a value" python script.py
+    {'errors': [], 'warnings': ['variable "my_hidden_variable" (My hidden variable) is hidden, it will be ignored when loading from environment variable']}
+
+Finally if a try to change the value of a secret, which is not allowed:
+
+.. code-block:: bash
+    $ LC_ALL=C env ROUGAIL_MY_SECRET_VARIABLE="MyVeryStrongPassword" python script.py 
+    {'errors': ['the variable "my_secret_variable" contains secrets and should not be defined in environment variable'], 'warnings': []}
+
+An error is generate.