What's the default value of "<transaction-attribute>" for MD

[joinow]

Hi Buddies,

I have a MDBean with its descriptor:
<message-driven>
...
<transaction-type>Container</transaction-type>
...
</message-driven>

But I do not set "<trans-attribute>".
<assembly-descriptor>
<container-transaction>
(nothing for that MDBean here)
<container-transaction>
<assembly-descriptor>

What will be used as default value by JBoss? Requied or Unsupported?

Thanks,
Justin

[joinow]

I find the link:
http://www.jboss.org/index.html?module=bb&op=viewtopic&p=3834024#3834024
But I can't find the answer in spec EJB2.1.