N/xml Module
Document.createElementNS()
Method Description: Creates a new node of type ELEMENT_NODE with the specified namespace URI and name and returns the new xml.Element object. The Node.localName, Node.prefix, and Node.namespaceURI properties of the new node are set to null.
Returns: xml.Element
Supported Script Types: All script types For more information, see SuiteScript 2.0 Script Types.
Governance: None
Module: N/xml Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Document.createElementNS(options)

// Code Example 1

//Add additional code

//...

var elem = xmlDocument.createElementNS({

    namespaceURI : '*',

    qualifiedName : 'book'

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_458257690428.html