def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'authorId'
          @author_id = value.value.to_i
        end
      end
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'pos'
          @position = OOXMLCoordinates.parse(node_child, x_attr: 'x', y_attr: 'y')
        when 'text'
          @text = node_child.text.to_s
        end
      end
      self
    end
def parse(node)
      node.attributes.each do |key, value|
        case key
        when 'authorId'
          @author_id = value.value.to_i
        end
      end
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'pos'
          @position = OOXMLCoordinates.parse(node_child, x_attr: 'x', y_attr: 'y')
        when 'text'
          @text = node_child.text.to_s
        end
      end
      self
    end
Parse PresentationComment object
 @param node [Nokogiri::XML:Element] node to parse
 @return [PresentationComment] result of parsing