# number of nodes
6
# end

# root
6
# end

# left-right order should be retained
# nodes (node#, name, label, instances)
1, "isbn", "ISBN"
2, "author", "Author"
3, "title", "Title"
4, "category", "Category", "Antiques, Art, Atlases, Audio, Automotive, Biography, Boating, Business, Calendars, Canadiana, CR-ROMs, Childcare, Children's Board Books, Children's Fiction, Children's Non-Fiction, Children's Picture Books, Classics of Literature, Colouring Books, Computers, Cooking, Crafts, Crosswords, Dictionaries, Entertainment, Fiction Hardcovers, Fiction Softcovers, First Nations, Games, Gardening, Health, History, Holidays, Home, Humour, Languages, Life, Maps, Mens Studies, Military, Mystery, Nature, New Age, Nutrition, Outdoor, Pets, Philosophy, Photography, Poetry, Psychology, Recovery, Reference, Religion, Romance, Science, Science Fiction, Sex, Sports, Stationery, Trains, Travel, True Crime, TSR, Videos, Westerns, Womens Studies, Wood"
5, "keyword", "Keyword"
6, "", ""
# end

# (level by level top-down, start from root)
# edges 
6-1,2,3,4,5
# end