I have a hierarchical data model (in the object oriented sense, vs.
the nested set sense) e.g. I have a PhysicalObject class /
physical_object table and a DigitalObject class / digital_object
table. The PhysicalObject and DigitalObject classes share common code,
so should both extend a common "Object" class. The physical_object and
digital_object tables share common columns, which I'd like to keep in
an "object" table.

Using symfony 1.1 and Propel, the PhysicalObject and DigitalObject
classes must extend the generated BasePhysicalObject and
BaseDigitalObject classes. The "Object" class extends the generated
BaseObject class. How can I implement this object oriented hierarchy?
How can I make the PhysicalObject and DigitalObject classes extend the
"Object" class?

Thanks! Jack


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