[Modeling-users] Implementing inheritance through vertical mapping

[Federico H. <fh...@vi...>]

Modeling does not implement vertical mapping yet, a feature we might[1]
be willing to contribute. However, from the looks of it, the XML schema
definition does not provide the needed information for it: the way it's
structured, it doesn't contain any provisions for telling the system
that a given class takes its data from a series of tables and not just
from one.

This can, of course, be corrected, and instantiating an object from
several tables at once was one of those things EOF did beautifully
(maybe still does). But the XML schema definition must be changed,
hopefully in a backwards-compatible way. Are there any plans about how
these changes could be implemented? We could suggest ways for doing it,
but if the issue has been discussed, we'd rather add our salt to the
discussion than make complete fools of ourselves :-)

	Fede
=20
[1] depending on priorities. We have done similar work in other
contexts, but for now we could choose to use PostgreSQL's inheritance
mechanism to implement the database, until we can spare the time to
create the vertical mapping layer.