Embedded and non Embedded Objects:

An embedded object is one which is completely contained in another. A column object is one which is represented as a column in a table. To take benefits of OO capabilities in which a database must also support ROW OBJECTS - Objects which are represented as rows alternate of columns.   The row objects are not embedded Objects; In other words, they are referenced objects, accessible through references from other objects.

Row Objects and Column Objects:

Objects in which appear in object tables are known as row objects. Objects which appear only in table columns or as attributes of other objects are known as column objects.