User vision of an order
=================================

For example, let's take the AFFE_MATERIAU command, which allows you to assign material characteristics to a mesh. Here is a possible use of this command in the command file provided by the Code_Aster user:

.. code-block:: text


    field = AFFE_MATERIAU (MAILLAGE = mail,
AFFE = _F (TOUT = 'OUI',
MATER = steel)
)

When using a command, it appears:


* the "user" name of the concept produced by the command: cham


* the name of the command: AFFE_MATERIAU


* one or more factor keywords: AFFE


* simple keywords: TOUT, MATER, MAILLAGE


* "user" names of argument concepts: steel, email


* simple values (integer, real, text,...) alone or in a list: 'OUI'

From the user point of view, by writing a name to the left of the "="sign of the command, we assign this name to the result of the command.

This "user name" is assigned a product concept (or data structure) calculated by the operator and whose type is given by the supervisor. The type of product concept is defined in the order catalog (See paragraph :ref:`Rédaction du catalogue de commande <RefHeading__3193_1229290806>`).

For example, field is the user name for the result of the command and to this name is associated the type concept cham_master.


.. _refheading__3193_1229290806: