CODE EXAMPLE FOR JAVASCRIPT

generate and download xml from javascript

var xmltext = "<sometag><someothertag></someothertag></sometag>";

var filename = "file.xml";
var pom = document.createElement('a');
var bb = new Blob([xmltext], {type: 'text/plain'});

pom.setAttribute('href', window.URL.createObjectURL(bb));
pom.setAttribute('download', filename);

pom.dataset.downloadurl = ['text/plain', pom.download, pom.href].join(':');
pom.draggable = true; 
pom.classList.add('dragout');

pom.click();