Just a couple of comments here:
First, if you put the Config xml file in the solution directory, then you don't need to specify a path. Typically I have a sub-folder in my SolDir for each project, and can then use a relative path for each Config xml I want to load. More on this approach here:
http://www.tdiingoutloud.com/2010/02/what-is-solution-directory.html
Second, I would suggest calling the xml file something beside rs.xml, as you did in your original post :)
You don't need to export this explicitly since TDI generates the Config xml each time you save, run or debug your solution. This file is written to the Runtime-<ProejctName> folder in the Workspace/<ProjectName> area.
You can also right-click on a Project, choose Properties and then Tivoli Directory Integrator properties. Here you can set up a Link File, so that the CE generates the Config xml as the file you specify (instead of under the Runtime-xxx folder)
Trivia: TDI was once called RelationshipServer - which is where 'rs' comes from :)
-Eddie