'Request a list of images and convert that list to a list of NodeImage
objects.
Request a list of images from the OpenNebula web interface, and
issue a request to convert each XML object representation of an image
to a NodeImage object.
:rtype:  ``list`` of :class:`NodeImage`
:return: List of images.'

def _to_images(self, object):

    images = []
    for element in object.findall('STORAGE'):
        image_id = element.attrib['href'].partition('/storage/')[2]
        image = self.connection.request(('/storage/%s' % image_id)).object
        images.append(self._to_image(image))
    return images
