Python XML processing with lxml

See Section 12.4, “subElement(): Adding a child element”.

# - - -   s u b E l e m e n t

def subElement ( parent, child ):
    '''Add a child node to the parent and return the child.

      [ (parent is an Element) and
        (child is an Element with no parent) ->
          parent  :=  parent with child added as its new last child
          return child ]
    '''
    #-- 1 --
    parent.append ( child )

    #-- 2 --
    return child