# File lib/fastri/ri_service.rb, line 187
  def matches(keyword, options = {})
    options = DEFAULT_INFO_OPTIONS.merge(options)
    return nil if keyword.strip.empty?
    descriptor = NameDescriptor.new(keyword)
    ret = obtain_entries(descriptor, options).map{|x| x.full_name}
    ret ? ret : nil
  rescue RiError
    return nil
  end