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It is helpful to see
the organization of the AutoCAD Database. There are the Symbol tables that
have been in AutoCAD drawings sense Release 12 of AutoCAD. These symbol
tables are used for elements such as layers and Linetypes. The Block Table
contains Model and Paperspace as well as other Blocks. These blocks which are
BlockTableRecords in the API contain the entities that you see rendered in
the AutoCAD editor. The Named Object Dictionary contains dictionaries that
were introduced in a later releases of AutoCAD. New functionality that it is
added in AutoCAD use the Named Objects Dictionary. Examples of this are
Layouts and PlotSettings. The database also has variables that are unique to
the drawing.
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