class REXML::Element

def xpath


e.xpath # => "foo"
e = REXML::Element.new('foo')

If there is no parent, returns the expanded name of the element:

c.xpath # => "/a/b/c"
b.xpath # => "/a/b"
a.xpath # => "/a"
d.xpath # => ""
c = b[0] # =>
b = a[0] # => ...
a = d.root # => ...
d = REXML::Document.new('')

relative to the most distant parent:
Returns the string xpath to the element

xpath -> string_xpath
:call-seq: 
def xpath
  path_elements = []
  cur = self
  path_elements << __to_xpath_helper( self )
  while cur.parent
    cur = cur.parent
    path_elements << __to_xpath_helper( cur )
  end
  return path_elements.reverse.join( "/" )
end