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Programmers documentation > Business objects and data sources > Shelves and cards > Overview of classes
 
Overview of classes
The complete hierarchy of predefined business objects is as follows:
*Shelves: instances of the class IltShelf
*Cards: instances of the class IltCard
*Empty slots: instances of the class IltEmptySlot
*Card carriers: instances of the class IltCardCarrier
*Ports: instances of the class IltPort
*LEDs: instances of the class IltLed
For a general introduction to predefined business objects, refer to Introducing business objects and data sources.
You can retrieve any of the above classes using the corresponding GetIlpClass method. You can handle any instance of these classes as a simple IlpObject and get and set their attributes with the generic methods getAttributeValue and setAttributeValue.

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