def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'dPr'
          node_child.xpath('*').each do |node_child_child|
            case node_child_child.name
            when 'begChr'
              @begin_character = ValuedChild.new(:string, parent: self).parse(node_child_child)
            when 'endChr'
              @end_character = ValuedChild.new(:string, parent: self).parse(node_child_child)
            end
          end
        end
      end
      @value = DocxFormula.new(parent: self).parse(node)
      self
    end
def parse(node)
      node.xpath('*').each do |node_child|
        case node_child.name
        when 'dPr'
          node_child.xpath('*').each do |node_child_child|
            case node_child_child.name
            when 'begChr'
              @begin_character = ValuedChild.new(:string, parent: self).parse(node_child_child)
            when 'endChr'
              @end_character = ValuedChild.new(:string, parent: self).parse(node_child_child)
            end
          end
        end
      end
      @value = DocxFormula.new(parent: self).parse(node)
      self
    end
Parse Delimiter object
 @param node [Nokogiri::XML:Element] node to parse
 @return [Delimiter] result of parsing