Value of `p:blipFill/a:blip/@r:embed`.

        Returns |None| if not present.

def blip_rId(self):
        """Value of `p:blipFill/a:blip/@r:embed`.

        Returns |None| if not present.
        """
        blip = self.blipFill.blip
        if blip is not None and blip.rEmbed is not None:
            return blip.rEmbed
        return None