Object data is non-graphical information about an object in a drawing.
When you want to add such data to a drawing or drawing object, you create an object data table to store the data.
A single object data table contains records of a similar structure, which is defined by the object data table's table definition. The individual records in an object data table may be associated with different drawing objects. The association between the data and the object is at the level of the individual record, not at the table level.
The classes used to create and manipulate object data tables are
AcMapODColumnDefinition AcMapODContainer AcMapODRecordIterator AcMapODTable AcMapODTableDefinition AcMapODTableRecord AcMapValue