The mapping DTD file (hibernate-mapping-3.0.dtd) currently forbids an idbag element inside a component element. Is this policy correct or is it a bug? The component element allows elements like map, set, list and bag, so why forbid idbag?

I have changed the DTD file to allow idbags inside components and so far it seems to be working fine.

I have seen a similar post on the NHibernate forum (http://forum.hibernate.org/viewtopic.php?t=961716&highlight=idbag+component), but there were no responses. This problem was already reported in the NHibernate Jira, though (http://jira.nhibernate.org/browse/NH-1044).

So is it a bug or not? Why would this be forbidden?

I have created a ticket for this issue in Hibernate's JIRA. Fell free to comment or vote for it. The link is http://opensource.atlassian.com/projects/hibernate/browse/HHH-2953.