Sony XDCAM is a popular brand of cameras for videographers. If you have been editing for a while it is quite possible that you will run into someone that has shot footage with this camera.
Below are a series of tutorials that will help you import footage and get started editing quickly with Final Cut Pro 7 and X.
XDCAM Final Cut Pro X Tutorial
Download the XDCAM plugin for Final Cut Pro X. (Please note this is an external link controlled by Sony and it may have changed, as of February 2014 it was accurate)
Step 1: Copy your XDCAM footage (entire BPAV Folder) to the Desktop or an External Hard Drive.
Step 1a: If you copy it to an external HD your events and projects will not show up in Final Cut Pro X
Step 2: File Import your footage to your specified event.