Trace and log -- How do I find documentation

Question

I was able to create (in the assign section) trace and log structures (by chosing the Logging and Alerting Button in the Netbeans IDE,
BPEL & Mapper - ....[Assign]):
<ns4:trace>
<ns4:log level="Info" traceLocation="OnStart">
<from><literal>This is a test of the logging OnStart</literal></from>
</ns4:log>
</ns4:trace>
however, it does not validate, so I added
<ns:extensionAssignOperation>
<ns4:trace>
<ns4:log level="Info" traceLocation="OnStart">
<from><literal>This is a test of the logging OnStart</literal></from>
</ns4:log>
</ns4:trace>
</ns:extensionAssignOperation>
Where is this documented, and if it works, could someone please send an example? I have tried a couple of different syntax, and
it does not do anything.
Thanks in Advance

Answer 1

What is the status on this? Has anyone got it to work?
I created a simple BPEL that has 'receive', 'assign', and 'reply' activities. For the 'assign' activity in the BPEL Mapper I assign several values to LOG_onStart, LOG_onComplete, ALERT_onStart, and ALERT_onComplete. Using critical or severe status.
I've enabled alerts and allow logging to syslog in the glassfish admin console but cannot get output? Is this feature supported?