rom the database.&nbsp; Typically, you add instances of DBExpression, although it's also possible to add property objects that are gotten from a database model.</font>

<p><font face="Times">When you add an expression object to a DBFetchGroup, the DBFetchGroup &quot;owns&quot; the object and is responsible for freeing it. If you don't want to surrender control of your expression objects, you should create a copies of them (and pass the copies in invocations of this method).&nbsp; If you're adding a model pr