def __iter__(self):
        image_parts = []
        for rel in self._package.iter_rels():
            if rel.is_external:
                continue
            if rel.reltype != RT.IMAGE:
                continue
            image_part = rel.target_part
            if image_part in image_parts:
                continue
            image_parts.append(image_part)
            yield image_part
Get the bounding box of all the ``[ref=...]``::
dataset/ETHPy150Open scanny/python-pptx/pptx/package.py/_ImageParts.__iter__--crossover with--dataset/ETHPy150Open kivy/kivy/kivy/core/text/markup.py/MarkupLabel.refs