class RubyXL::WorkbookRoot

def self.parse_file(xl_file_path, opts)
  begin
    ::Zip::File.open(xl_file_path) { |zip_file|
      root = self.new
      root.filepath = xl_file_path
      root.content_types = RubyXL::ContentTypes.parse_file(zip_file)
      root.load_relationships(zip_file, OOXMLTopLevelObject::ROOT)
      root.workbook.root = root
      root
    }
  rescue ::Zip::Error => e
    raise e, "XLSX file format error: #{e}", e.backtrace
  end
end