When you choose one of the "Final Cut Pro" Easy Setups in the current Resolve 10, the resulting XML will be a .fcpxml used in FCP X. You can achieve a .xml file by choosing "None" in your Easy Setups and manually selecting your desired Output options. After the render finishes, navigate to the Edit page and choose File > Export AAF/XML. This will open a dialog where you can choose your file name and location and also choose the type of file you wish to export. The current options as of this post include: *.aaf, *.xml, *.fcpxml (1.2), *.fcpxml (1.3), and *.edl.
This is also discussed in the current Resolve manual in Chapter 11 "Exporting Timelines to Other Applications."
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