Restructure Tree of Attributes
==============================

In order to avoid :doc:`combinatorial explosion <DEXiGlosExplos>` in
:doc:`DEXi <DEXi>` :doc:`models <DEXiGlosMAMod>`, it is strongly
advised to structure the :doc:`tree of attributes <DEXiGlosTree>` so
that each aggregate :doc:`attribute <DEXiGlosAttr>` has only two or
three immediate descendants. Whenever you encounter an aggregate
attribute with four descendants, you may want to consider restructuring
the tree below that attribute. Usually, there are several ways to do
this:

.. image:: images/4to3.png
   :alt: Restructuring Tree of Attributes

In all cases, you should regroup the lower-level attributes and
introduce one or two new aggregate attributes, denoted by |New
Attribute|.

Usually, the 'right' structure is the one that appears the most
'logical' so that:

-  it groups together similar or related attributes, and
-  it is easy to give names to the newly created attributes.

.. |New Attribute| image:: images/Circle.png

.. toctree::
  :hidden: