code: func (s *SiteInfo) SitemapAbsURL() string {
  	p := s.HomeAbsURL()
  	if !strings.HasSuffix(p, "/") {
  		p += "/"
  	}
  	p += s.s.siteCfg.sitemap.Filename
  	return p
  }
docs: // SitemapAbsURL is a convenience method giving the absolute URL to the sitemap.