This is a technical description of the 3.x branch of the module. For the newer 4.x branch, see this article.
Simple XML sitemap 3.1 has been released
The third major version of simple_sitemap has been long in the making bringing a more reliable generation process, a significantly more versatile API and many new functionalities. The first minor ugrade of the 3.x branch comes with views support and human readable sitemaps.
Major new features in 3.1
Views and views arguments support
Including view display URLs in the sitemap has been possible through adding these URLs as custom links in the UI (or via the API).
View variations created by view arguments however are tedious to include as one would have to include every version of the URL.
The integration of the simple_sitemap_views inside simple_sitemap 3.x makes it easily doable via the UI.
Thanks to @WalkingDexter for his tremendous work on this submodule!
Human-readable sitemaps with XSL stylesheets
Before: