Alternate href urls breaks sitemap

[4FunAndProfit]

Hello !

When i tried with alternate href like in the readme i have the following error on google console:

The element 'url' has invalid child element 'link' in namespace 'http://www.w3.org/TR/xhtml11/xhtml11_schema.html'. List of possible elements expected: any element in namespace 'http://www.google.com/schemas/sitemap-image/1.1, http://www.google.com/schemas/sitemap-mobile/1.0, http://www.google.com/schemas/sitemap-video/1.1'. 

I think it is related to : https://developers.google.com/search/docs/specialty/international/localized-versions#example_2 . They said to Specify the xhtml namespace as follows:

xmlns:xhtml="http://www.w3.org/1999/xhtml"

I did not find a way to make it work with this plugin but maybe that's me who is wrong on my way to do it

[bravo-kernel]

Indexes and sitemaps work fine. Just make sure to pass in the correct object structure.

// generateSitemapIndex(sitemaps)

 →  sitemaps [
  {
    url: 'http://localhost:5173/sitemap-default.xml',
    lastmod: '2025-05-24',
    languageCode: 'default',
    hreflang: 'x-default'
  },
  {
    url: 'http://localhost:5173/sitemap-en.xml',
    lastmod: '2025-05-24',
    languageCode: 'en',
    hreflang: 'en'
  },

// generateSitemap(domain, routes)
 →  routes [
  {
    "url": "/",
    "sitemapEntries": {
      "route": "http://localhost:5173/",
      "alternateLinks": [
        {
          "hreflang": "x-default",
          "href": "http://localhost:5173/"
        },
        {
          "hreflang": "en",
          "href": "http://localhost:5173/?lang=en"
        },
        {
          "hreflang": "nl",
          "href": "http://localhost:5173/?lang=es"
        }
      ],
      "lastmod": "2025-05-24"
    }
  },