********
OBITypes
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.. image:: ./images/OBITypes_UML.png
:download:`html version of the OBITypes UML file <UML/OBITypes_UML.class.violet.html>`

.. note::
    All OBITypes have an associated NA (Not Available) value.
    We have currently two ideas for implementing NA values:
    
    		- By specifying an explicit NA value for each type
    		- By adding to each column of an OBIDMS a bit vector
    		  indicating if the value is defined or not.



.. toctree::
   :maxdepth: 2

   The elementary types <elementary>
   The containers <containers>