xml data binder with IDREF and substition group support?

[Elhanan]

hi..

aside from jaxb does anyone know of a data binding framework which
support the use of IDREF (meaning in java use a the setter to set an
object but in xml retrive only the id) and subsition groups as
polymorphism?

castor has a bug regarding the groups, xml beans does seem to support
IDREF like jaxb.

anything else?