def parse(file)
      return nil unless File.exist?(file)

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

      node.attributes.each do |key, value|
        case key
        when 'count'
          @count = value.value.to_i
        when 'uniqueCount'
          @unique_count = value.value.to_i
        end
      end

      node.xpath('*').each do |node_child|
        case node_child.name
        when 'si'
          @string_indexes << StringIndex.new(parent: self).parse(node_child)
        end
      end
      self
    end
def parse(file)
      return nil unless File.exist?(file)

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

      node.attributes.each do |key, value|
        case key
        when 'count'
          @count = value.value.to_i
        when 'uniqueCount'
          @unique_count = value.value.to_i
        end
      end

      node.xpath('*').each do |node_child|
        case node_child.name
        when 'si'
          @string_indexes << StringIndex.new(parent: self).parse(node_child)
        end
      end
      self
    end
Parse Shared string table file
 @param file [String] path to file
 @return [SharedStringTable]