All columns that are categories can be included, i.e. built-in and custom. The order they appear in the list is irrelevant, it's the number after the column name that matters. Example:
Code:
{u'#booksource': 3,
u'#all_the_book_sources': 5,
u'#genre': 6,
u'#currentbookshelves': 4,
u'#dashed_current_bookshelves': 7,
u'*': 8,
u'authors': 1,
u'publisher': 2}
BR