Description of problem: If it's not too late then, and "svn_url" isn't written in stone, then I suggest renaming that directive to something version control system-agnostic. This would reduce confusion when using git or another VCS for source files. Possible candidates:

vcs_url

OR

version_control_url

I'm not sure if it would be necessary or product to also have a directive called something like "vcs_type" or "version_control_type"; often the vcs type is embedded in the URL, but possibly not always.

Version-Release number of selected component (if applicable): publican 3.0 pre-release.
  
Actual results: "svn_url" is used


Expected results: "vcs_url" is used instead


Additional info: fairly minor renaming change. 'svn_url' is not documented in http://jfearn.fedorapeople.org/en-US/Publican/3.0/html-single/Users_Guide/