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This mask is used to determine empty tags, for example tags that are not actually empty but contain some test data from manufacturing. The mask should contain the values, and uses a question mark (?) to denote a character that is ignored. For example, a typical value would be

 

 0000000000000000????????00000000

 

This would check if there is 16 zero characters, followed by 8 characters having any value, and finally 8 more zero characters - this would then be considered an empty tag.