How to indicate alternate language pages? about sitemap.js HOT 21 CLOSED

    var smap = sm.createSitemap({
          urls: [{
              url: 'http://test.com/page-1/',
              changefreq: 'weekly',
              priority: 0.3,
              links: [
                  { lang: 'en', url: 'http://test.com/page-1/', },
                  { lang: 'ja', url: 'http://test.com/page-1/ja/', },
              ]
          },]
        });

var options = {
            hostname: config.clientUrl,
            cacheTime: 600000,        // 600 sec - cache purge period
            urls: [{
                url: 'http://test.com/page-1/',
                changefreq: 'weekly',
                priority: 0.3,
                links: [
                    { lang: 'en', url: 'http://test.com/page-1/', },
                    { lang: 'ja', url: 'http://test.com/page-1/ja/', },
                ]
            },]
        };

        var sm = require('sitemap');
        var sitemap = sm.createSitemap(options);

        sitemap.toXML( function(xml){
            cb(null,xml);
        });

http://test.com/page-1/ weekly 0.3

> var options = {
...     hostname: 'http://test.com',
...     cacheTime: 600000,        // 600 sec - cache purge period
...     urls: [{
.....         url: 'http://test.com/page-1/',
.....         changefreq: 'weekly',
.....         priority: 0.3,
.....         links: [
.....             { lang: 'en', url: 'http://test.com/page-1/', },
.....             { lang: 'ja', url: 'http://test.com/page-1/ja/', },
.....         ]
.....     },]
... };
undefined
> 
undefined
> var sm = require('./index');
undefined
> var sitemap = sm.createSitemap(options);
undefined
> sm.version
'1.0.0'
> 
undefined
> sitemap.toString();
'<?xml version="1.0" encoding="UTF-8"?>\n
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" 
xmlns:xhtml="http://www.w3.org/1999/xhtml"
 xmlns:image="http://www.google.com/schemas/sitemap-image/1.1">\n
  <url>
    <loc>http://test.com/page-1/</loc>
    <changefreq>weekly</changefreq> 
    <priority>0.3</priority>
    <xhtml:link rel="alternate" hreflang="en" href="http://test.com/page-1/" />
    <xhtml:link rel="alternate" hreflang="ja" href="http://test.com/page-1/ja/" />
  </url>\n
</urlset>'

app.get('/sitemap.xml', function(req, res) {
  var hostname = req.protocol + '://' + req.get('host');
  var sitemap = sm.createSitemap ({
    cacheTime: 600000,        // 600 sec - cache purge period
    hostname: hostname,
    urls: [
      {
        url: hostname + '/',
        changefreq: 'weekly',
        links: [
          { lang: 'fr', url: hostname + '/', },
          { lang: 'en', url: hostname + '/en/', }
        ],
        priority: 0.7
      },
      {
        url: hostname + '/agence/',
        changefreq: 'weekly',
        links: [
          { lang: 'fr', url: hostname + '/agence/', },
          { lang: 'en', url: hostname + '/agency/', }
        ],
        priority: 0.7
      }
    ]
  });

  res.header('Content-Type', 'application/xml');
  res.send( sitemap.toString() );
});

➥ cat testing2.js 
var hostname = 'https://true.example.com';

var sm = require('sitemap');
var sitemap = sm.createSitemap ({
    cacheTime: 600000,        // 600 sec - cache purge period
    hostname: hostname,
    urls: [
      {
        url: hostname + '/',
        changefreq: 'weekly',
        links: [
          { lang: 'fr', url: hostname + '/', },
          { lang: 'en', url: hostname + '/en/', }
        ],
        priority: 0.7
      },
      {
        url: hostname + '/agence/',
        changefreq: 'weekly',
        links: [
          { lang: 'fr', url: hostname + '/agence/', },
          { lang: 'en', url: hostname + '/agency/', }
        ],
        priority: 0.7
      }
    ]
  });

console.log(sitemap.toString());