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A subject area is a subset of objects taken from the whole pool of objects in your diagram.
It is important to understand that the subject areas are not copies of the data model, but are dynamic subsets of the data model. In other words, if you add members to a subject area those objects are added to the current subject area.
If you add an attribute or column to an existing entity or table, the new object is added to every subject area in which the entity or table is a member.
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