Parse drawing element.

    We don't do much with drawing element. We can find embeded image but we don't do more than that.

def parse_drawing(document, container, elem):
    """Parse drawing element.

    We don't do much with drawing element. We can find embeded image but we don't do more than that.
    """

    _blip = elem.xpath('.//a:blip', namespaces=NAMESPACES)

    if len(_blip) > 0:
        blip = _blip[0]
        _rid = blip.attrib[_name('{{{r}}}embed')]

        img = doc.Image(_rid)
        container.elements.append(img)