For XDCAM Browser you need the optional advanced pack.
http://www.sonycreativesoftware.com/xdcampack?keycode=731500
This will allow you to export an AAF file (without the media).
If you don't want to spend the money on the option you can simply use a clip list and AMA. Write the clip list back to the origianl XDCAM disc. When you load the disk using AMA in Composer the clip list should show up at the top of the bin as a sequence. From there you can consolidate, transcode, etc., etc.
*Disclaimer - My work flow tests were done using PC computers (WinXP/7, MC 5.5). I have no idea if these methods will work on the Mac side.