The dtd allows the element <unknown-pk> in the and in the section.

a)
<unknown-pk> in the section works as expected

b)

...
<unknown-pk>
</unknown-pk>
...


results in an error:
... "unknown-pk" incomplete ...
Still fine.

c)

...
<unknown-pk>
<unknown-pk-class>java.lang.Long</unknown-pk-class>
</unknown-pk>
...


The use of any regular subelement of <unknown-pk> as for instance <unknown-pk-class> results in the inexplicable error:
...
The content of element type "entity" must match ... unknown-pk?
...

Anyone has an example how to override the unknown-pk defaults ( JBoss 3.2 & MySQL ) ?