def _process_image_id(self):
try:<EOL><INDENT>image_info = self.image_id.strip().split('<STR_LIT::>')<EOL>self.image_publisher = image_info[<NUM_LIT:0>]<EOL>self.image_offer = image_info[<NUM_LIT:1>]<EOL>self.image_sku = image_info[<NUM_LIT:2>]<EOL>self.image_version = image_info[<NUM_LIT:3>]<EOL><DEDENT>except Exception:<EOL><INDENT>self.image_publisher = None<EOL><DEDENT>
Split image id into component values.

Example: SUSE:SLES:12-SP3:2018.01.04
         Publisher:Offer:Sku:Version

Raises:
    If image_id is not a valid format.