> how I can run it? open XML file > open blog.xml -a Safari

This didn't work for me on my browsers (FF/Chrome/Safari) on Mac, apparently XSLT only works there when accessed through HTTP:

    $ python3 -m http.server --directory .
    $ open http://localhost:8000/blog.xml

I remember long hours using XSLT to transform custom XML formats into some other representation that was used by WXWindows in the 2000s, maybe I should give it a shot again for Web :)