Adding Namespaces to a DOM Element python

I want to produce this xml file with python and minidom:

<xml vesion="1.0" encoding="utf-8?>
<package name="Operation" xmlns="http://www.modelIL.eu/types-2.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.modelIL.eu/types-2.0 modelIL-package-2.0.xsd">
</package>

I have wrote this:

import xml.dom.minidom as dom

document = dom.Document()
root_xml = document.createElement("package")
root_xml.setAttribute("name", "Operation")
root_xml.setAttributeNS("", "xmlns", "http://www.modelIL.eu/types-2.0")
root_xml.setAttributeNS("xmls", "xsi", "http://www.w3.org/2001/XMLSchema-instance")
root_xml.setAttribute("xsi:schemaLocation", "http://www.modelIL.eu/types-2.0 modelIL-package-2.0.xsd")
root = document.appendChild(root_xml)

print(document.toprettyxml(indent("    "))

But the output I get is this one:

<xml vesion="1.0" ?>
<package name="Operation" xmlns="http://www.modelIL.eu/types-2.0" xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.modelIL.eu/types-2.0 modelIL-package-2.0.xsd">
</package>

Why do I have only xsi and not xmlns:xsi? Did I forget something?