[Koha-devel] about MARC structure : additionalauthor and illustrator

Hi guys, I'm working on MARC stuff and have a question about additionalauthors and illustrators. In Steve stuff, he use for every author/illustrator, a 700 field, with $a containing the name and $e containing the role (author or illustrator) In my UNIMARC manual, i can find : 700 : main responsability : $a as name, and $4 as title. I have no $e subtag. 701 : second responsability : same structure. How to solve the difference ? -- Paul