def parse(file = "#{OOXMLDocumentObject.path_to_folder}/#{OOXMLDocumentObject.root_subfolder}/comments/comment1.xml")
      return nil unless File.exist?(file)

      document = parse_xml(File.open(file))
      node = document.xpath('*').first

      node.xpath('*').each do |node_child|
        case node_child.name
        when 'cm'
          @list << PresentationComment.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(file = "#{OOXMLDocumentObject.path_to_folder}/#{OOXMLDocumentObject.root_subfolder}/comments/comment1.xml")
      return nil unless File.exist?(file)

      document = parse_xml(File.open(file))
      node = document.xpath('*').first

      node.xpath('*').each do |node_child|
        case node_child.name
        when 'cm'
          @list << PresentationComment.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse PresentationComments object
 @param file [Nokogiri::XML:Element] node to parse
 @return [PresentationComments] result of parsing