[jbpm-users] Embed jBPM in our application without database

Hi all, I'm new to jBPM and I'm trying to figure out how to invoke a jBPM workflow defined in a jpdl.xml file without using database, the version I'm currently using is jBPM 4-alpha. In the developer's guide there is an introduction to object execution mode and the example shows how to build a jBPM workflow defination from Java code, my question is if it's possible to build a workflow def from an xml instead in object execution mode so that I can avoid creating a database? Any suggestion is appreciated. Best wishes, Mai Sun