def parse(file)
      node = parse_xml(file)
      node.xpath('p:notes/*').each do |node_child|
        case node_child.name
        when 'cSld'
          @common_slide_data = CommonSlideData.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(file)
      node = parse_xml(file)
      node.xpath('p:notes/*').each do |node_child|
        case node_child.name
        when 'cSld'
          @common_slide_data = CommonSlideData.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse PresentationNotes object
 @param file [String] file to parse
 @return [PresentationNotes] result of parsing