Defaults to nil, i.e. non-normalized schemas. When true,
SQL database tables that map to this class and parent
classes are joined on their primary keys to get the full
- set of database columns for this class.
+ set of database columns for this class. This means that
+ the primary key of the base class will be copied to all
+ subclasses as we insert so that all parent classes of an
+ instance will have the same value in their primary key slots
+ (see tests/ds-nodes.lisp and oodml.lisp)
</para>
</listitem>
</itemizedlist>