If you examine the
database of brand new drawing you will find that a dictionary is
automatically created. The name of this dictionary is the Named Objects
Dictionary. Commonly referred to as the NOD. This dictionary will contain
other dictionaries. You can think of it as the root dictionary for the
drawing and it is used to store data
at the database level. There is another type of dictionary that can be
created. It is called an Extension dictionary an it can exist for any Entity
in the drawing. You use the extension dictionary to store data with that
entity. This dictionary is only created by a custom program and does not
exist by default. Lets use our MgdDBG
example to see the dictionaries in the AutoCAD drawing database. |