[NTG-context] registers - only part of an entry to be italics

Let me add one more difficulty I have come across with registers. I need the title of a book to be in italics (and know exactly how to do that with \defineprocessor), but the author's name to follow is to be normal, not italic. So I need: /book name/, author name. I tried setting up a second \defineprocessor with style=normal and introducing that after the first one in an index entry, but I can see that only one processor can be introduced in an entry, not two. How can I achieve the desired result? Julian