Chapter 14.1.1 of the jBPM Reference Guide [1] is not up to date. The following changes are necessary:

1. Wrong attribute in the <deploypar ..> element:
<deploypar par="build/myprocess.par" />

needs to be changed to :
<deploypar process="build/myprocess.par" />

2. Remove attributes 'createschema' and 'properties' from table 14.1, as they no longer exist in DeployProcessTask

3. Add attribute 'failonerror' to table 14.1:
"When set to true, the deployment task fails immediately with an error if the deployment of one process definition fails. Default is true"

4. Change: "To deploy process archives programmatically, use the org.jbpm.jpdl.par.ProcessArchiveDeployer class."
To: "To deploy process archives programmatically, use one of the parseXXX methods of the org.jbpm.graph.def.ProcessDefinition class.

[1] http://docs.redhat.com/docs/en-US/JBoss_Enterprise_SOA_Platform/5/html/JBPM_Reference_Guide/jpdl.html