http://www.processconfiguration.com/download.html 注意各种建模工具源码研究
http://www.xes-standard.org/openxes/start
http://www.docmgr.org/ http://jackrabbit.apache.org/ http://www.jboss.org/exojcr
(Virtual file system,比如intellij open source版中的vfs, openxes里的nikefs2)