On Aug 8, 2005, at 10:16 PM, Werner Guttmann wrote:
Henk,
polymorphism in Castor JDO will solely be expressed through the
'extend'
relationship.
Werner
OK ,I understand. Even so, there are two ways to express subclassing:
- Put the superclass fields in a separate table. As I understand,
this is the way Castor currently handles subclassing.
- Have a common set of fields for every subclass table. Even though
this violates normalization, it is a common pattern.
A possible way of handling this could be the introduction some
kind of <fieldset> element. <class> elements could then refer to a
common set of field descriptors.
I would like to discuss this more in depth, but the Castor Forums
seem to be offline since the exolab -> codehaus move
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