It seems that all of the initial Google results for \"using subversion with xcode\" are actually just tutorials for installing and configuring svn and Xcode, as opposed to a
I know this is not quite what you asked, but I wouldn't rely much on the use of SVN from Xcode as what you can do with it is very limited. It's useful for being able to do a diff or annotate direct from the IDE but not a great deal else. I don't think it's any substitute for using a separate standalone client such as SmartSVN or Versions.
You also have to jump through a number of hoops to get Xcode to work with SVN version 1.5 onwards, so that's something to be aware of before installing a standalone client. If in doubt, check out a sandbox first.