How to use xPath with namespace?

Webix JS
#1

How to correctly extends DataDriver (xml) so it can take xml with namespace?
Left form show data from xml without namespace.
Right from must show data from xml with namespace.
https://snippet.webix.com/rfri9jdu

#2

In case xml with namespace datadriver create object with fullnames - namespace+tag. Therefore, it is enough to indicate the element’s name of form as tag with namespace - ‘ns1:name2’.

https://snippet.webix.com/3ztxqx3o