# number of nodes
9
# end

# root
9
# end

# left-right order should be retained
# nodes (node#, name, label, instances)
1, "ctitle", "Title"
2, "CAUTHOR", "Author"
3, "keyword", "Keyword"
4, "SEARCH_TEXT", "ISBN"
5, "IMPRINT", "Publisher"
6, "FILTER_binding_code", "formats", "Paperbacks only, Hardbacks only, Audiobook (CD), Audiobook (Cass), CD-ROM, Bath Book, Video cassette, Video/Laser Disc"
7, "FILTER_reader_code", "", "All readership levels, Children, A Level, Secondary, Primary, Open Uni. set book, Revision guide, ELT general, ELT advanced, ELT beginner, ELT intermediate, Research"
8, "", "Search Filters"
9, "", ""
# end

# (level by level top-down, start from root)
# edges 
9-1,2,3,4,5,8
8-6,7
# end