# File lib/yaml_db.rb, line 60
    def self.load_documents(io, truncate = true)
        YAML.load_stream(io) do |ydoc|
          ydoc.keys.each do |table_name|
            next if ydoc[table_name].nil?
            load_table(table_name, ydoc[table_name], truncate)
          end
        end
    end