The jpdl xsd needs to be updated to reflect the fact that transitions in fork activities can have nested condition elements. Looking at the code for ForkActivity, it's apparent that <fork> activities do evaluate conditions for outgoing transitions.

Example:

<fork name="fork1">
<transition to="always_do_this"/>
<transition to="sometimes_do_this" >
<condition expr="#

"/>
</transition>
</fork>