The Gen 2 RFID tags support the EPC Tag Data Standard. This contains standards for storing supplementary GS1 data in common fields such as Batch/Lot Number, Due Date, Expiration date.
I am curious whether there are any similar "tag data" standards for the user memory of HF RFID tags with (13.56 MHz center frequency) and specifically those which are ISO/IEC 14443 compliant? User memory refers to the areas in a tag which contains the actual data. For example, in an NTAG-215 or MiFARE MF0UL21 tag there is a user memory from page 4 onwards.
Basically, I'm interested in a standards-based approach for storing data in the user memory area such as batch/lot number and expiration data in a ISO/IEC 14443 compliant tag? Does such as standard exist? Or it is more common to store data in proprietary form?