Is it posible to create a XML node with prefix in Javascript?

There is document.createElementNS, see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-DocCrElNS, where you use var el = document.createElementNS('http://your-namespace-uri-here', 'prefix:localnamehere'). Should work in DOM Level 2 or 3 implementations like Mozilla or Opera or Chrome or new versions of IE offer for XML DOM documents.

var ns1 = 'http://example.com/ns1';
var ns2 = 'http://example.org/ns2';

var doc = document.implementation.createDocument(ns1, 'pf1:root', null);

var el1 = doc.createElementNS(ns1, 'pf1:foo');
el1.setAttribute('id', 'e1');
doc.documentElement.appendChild(el1);

var el2 = doc.createElementNS(ns2, 'pf2:bar');
el1.appendChild(el2);

var pre = document.createElement('pre');
pre.textContent = new XMLSerializer().serializeToString(doc);

document.body.appendChild(pre);

In older versions of IE however the XML DOM is only supported by MSXML and ActiveX and there you need to use a createNode method, see https://msdn.microsoft.com/en-us/library/ms757901%28v=vs.85%29.aspx.

You could use:

nodeObject.prefix=prefix

that will return:

nodeObject.prefix

I think i am on the right track... here is my code. Its with createElementNS.

Thanks Martin :).

var container = document.createElement("root");
var bpmn = document.createElementNS('http://your-namespace-uri-here','bpmn:definitions');
    bpmn.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:xsi","http://ww w.w3.org/2001/XMLSchema-instance");
    bpmn.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:bpmn","http://www.omg.org/spec/BPMN/20100524/MODEL");
    bpmn.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:bpmndi","http://www.omg.org/spec/BPMN/20100524/DI");
    bpmn.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:di","http://www.omg.org/spec/DD/20100524/DI"); 
    bpmn.setAttributeNS("http://www.w3.org/2000/xmlns/","xmlns:dc","http://www.omg.org/spec/DD/20100524/DC");

var process = document.createElementNS("task",'bpmn:process');
process.id="Process_1";
process.setAttribute("isExecutable","false");

var sequenceFlow = document.createTextNode("sequenceFlow_1");

var start = document.createElementNS("task",'bpmn:startEvent');
start.id="StartEvent_1";
var outgoing = document.createElementNS("task",'bpmn:outgoing');
outgoing.appendChild(sequenceFlow)  
start.appendChild(outgoing);

var sequenceFlow1 = document.createTextNode("sequenceFlow_1");
var incoming = document.createElementNS("incoming","bpmn:incoming");
incoming.appendChild(sequenceFlow1)

var task = document.createElementNS("task","bpmn:task");
task.id = "Task_1";
task.setAttribute("name","Titulo112");

task.appendChild(incoming);
process.appendChild(start);
process.appendChild(task);
bpmn.appendChild(process);

container.appendChild(bpmn);

console.debug(container);