DOM XML Implementation

xmldom.js

// Directly pass this as string

let xmlString = `<ern:NewReleaseMessage xmlns:ern="http://ddex.net/xml/ern/382"
                       MessageSchemaVersionId="ern/382"
                       LanguageAndScriptCode="en"
                       xs:schemaLocation="http://ddex.net/xml/ern/382 http://ddex.net/xml/ern/382/release-notification.xsd"
                       xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"></ern:NewReleaseMessage>`;
let parser = new DOMParser();
let xmlDoc = parser.parseFromString(xmlString, "text/xml");

// Or create programmatically

xmlDoc = document.implementation.createDocument(
  "http://ddex.net/xml/ern/382",
  "ern:NewReleaseMessage",
  null,
);
xmlDoc.documentElement.setAttribute('MessageSchemaVersionId', 'ern/382');
xmlDoc.documentElement.setAttribute('LanguageAndScriptCode', 'en');
xmlDoc.documentElement.setAttributeNS('http://www.w3.org/2001/XMLSchema-instance', 
                    'xs:schemaLocation', 
                    'http://ddex.net/xml/ern/382 http://ddex.net/xml/ern/382/release-notification.xsd');


// Modify the dom

let el = xmlDoc.createElement('UpdateIndicator')
el.textContent = 'OriginalMessage'
xmlDoc.documentElement.appendChild(el)

// Serialize

let xmlResult = new XMLSerializer().serializeToString(xmlDoc);