'Converts this object into an etree element and adds it as a child
node in an etree element.
Adds self to the ElementTree. This method is required to avoid verbose
XML which constantly redefines the namespace.
:param element_tree: ElementTree._Element The element to which this
object\'s XML will be added.'

def become_child_element_of(self, element_tree):

    new_element = self.transfer_to_element_tree()
    element_tree.append(new_element)
