def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'pPr'
          @properties = ParagraphProperties.new(parent: self).parse(node_child)
        when 'fld'
          @text_field = TextField.new(parent: self).parse(node_child)
        when 'r'
          @runs << ParagraphRun.new(parent: self).parse(node_child)
        when 'AlternateContent'
          @alternate_content = AlternateContent.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'pPr'
          @properties = ParagraphProperties.new(parent: self).parse(node_child)
        when 'fld'
          @text_field = TextField.new(parent: self).parse(node_child)
        when 'r'
          @runs << ParagraphRun.new(parent: self).parse(node_child)
        when 'AlternateContent'
          @alternate_content = AlternateContent.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse Paragraph object
 @param node [Nokogiri::XML:Element] node to parse
 @return [Paragraph] result of parsing