def location_xml
      location = REXML::Element.new('location')
      location.add_element('building').text = @building
      location.add_element('department').text = @department
      location.add_element('email_address').text = @email_address
      location.add_element('position').text = @position
      location.add_element('phone').text = @phone
      location.add_element('real_name').text = @real_name
      location.add_element('room').text = @room
      location.add_element('username').text = @username
      return location
    end
def location_xml
      location = REXML::Element.new('location')
      location.add_element('building').text = @building
      location.add_element('department').text = @department
      location.add_element('email_address').text = @email_address
      location.add_element('position').text = @position
      location.add_element('phone').text = @phone
      location.add_element('real_name').text = @real_name
      location.add_element('room').text = @room
      location.add_element('username').text = @username
      return location
    end
@api private

 Return a REXML <location> element to be
 included in the rest_xml of
 objects that have a Location subset

 @return [REXML::Element]