I'm new to jBPM and I'm trying to figure out how to use expressions.

Lets say i've got the following process:

<?xml version="1.0" encoding="utf-8"?>
<process name="StartCondities" xmlns="http://jbpm.org/4.4/jpdl" >


  <start name="Start" g="21,161,48,48" >
    <transition name="SequenceFlow_1" to="start_condition"/>
  </start>


  <decision name="start_condition" expr="#{content}" g="146,161,48,48" >
    <transition name="low" to="Level_1"/>
    <transition name="normal" to="Level_2" g="171,70:"/>
    <transition name="high" to="Level_3" g="171,325:"/>
  </decision>


  <task name="Level_1" assignee="a" g="330,30,100,80" >
    <transition name="SequenceFlow_3" to="End" g="505,70;505,185:"/>
  </task>


  <task name="Level_2" assignee="a" g="330,145,100,80" >
    <transition name="SequenceFlow_2" to="End"/>
  </task>


  <task name="Level_3" g="330,285,100,80" >
    <transition name="SequenceFlow_4" to="End" g="501,325;501,185:"/>
  </task>


  <end name="End" ends="processinstance" g="545,161,48,48" />


</process>

I know how to start the process using a single variable to immediatly go to the correct task, by using content='normal'

But I'm want to make the expression a little bit more complex.

I'm giving 2 variables at start of the process (I know how to do this)

type='bug'

priority='high'

Can I make the expression something like this:
IF (type='bug' AND priority='high') THEN transition 'high'

ELSE IF (type='question' AND priority='normal') THEN transition 'low'

ELSE transition 'normal'