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Yes, there are two layers in Eclipse:

There is the Eclipse Framework, This is the frame that contains the programs, the menu, buttons, etc. Most of these things can be extended by plugins.

Inside this there are programs like the Java editor and compiler, but we don't have to use these for instance, there are XML editors, C++ editors etc. which can be used within the eclipse framework.

So if we wanted to use Eclipse we could do it in stages:
1) implement a program that would import and export XES.
2) implement a XES editor that that would run in the framework and would directly edit XES (by modifying the Eclipse or JEdit editor?)
3) implement a compiler that that would run in the framework and would directly compile XES.

Martin