Comment 3 for bug 810202

1. No, I chose the comma as the delimiter for simplicity. I guess we could check for an escaped comma or something but it didn't seem worth it. I'm not familiar with Guile's string processing, but it's possible there is something smarter than string-split.

2. backend-getopt print out the error message, which includes a backtrace (I guess because of the use of scm-error?). Things exit out gracefully after that as far as I can tell. The backtrace makes the error message seem a little more intimidating, but last line should be reasonable (e.g. "Backend options 'attribs' requires an argument")

3. -Oattribs takes precedence and overrides anything in the file (either attribs or a specified file).