You can create a link
between an object in the drawing and a record in a database table.
You cannot create a link to a feature from a feature source.
You cannot create links
for non-graphical objects, such as layers and linetypes.
When you create a link,
link data is stored on the object. The link data has two parts:
the name of the link template to use, and the actual value to search for
in the key column. The record with the matching key value is linked
to the object.