I have two projects in Eclipse with Java and Python code, using Jython. Also I'm using PyDev. One project can import and use the xml module just fine, and the other gives the error ImportError: No module named xml. As far as I can tell, all the project properties are set identically. The working project was created from scratch and the other comes from code checked out of an svn repository and put into a new project.
What could be the difference?
edit- Same for os, btw. It's just missing some path somewhere...
eclipse stores project data in files like

.project 
.pydevprojct
.classpath

with checkin / checkout via svn it is possible to lost some of these files
check your dot-files
Jython project in Eclipse can't find the xml module, but works in an identical project