.. py:function:: create_if_tree(expression, then, else_, position = None, label_width = 0)

   
   Create a decision in the intermediate structure if it is a tree structure.

   The graphical properties are expressed 1/100th of mm.

   They are considered if and only if the owning if block
   has a graphical representation.

   Hint for the graphical properties: The size of a node is 80x80. Consider
   this offset to have consistent values between if nodes and actions.

   :Parameters:

       **expression** : :obj:`EX`
           Extended expression tree defining the condition of the decision.

       **then** : :obj:`IT`
           Sub-decision tree to consider when the condition is ``True``.

       **else\_** : :obj:`IT`
           Sub-decision tree to consider when the condition is ``False``.

       **position** : :obj:`Tuple`\[:class:`python:float`, :class:`python:float`], default: :data:`python:None`
           Position of the decision.

       **label_width** : :class:`python:int`, default: 0
           Size of the label.

   :Returns:

       :obj:`IT`
           ..













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