Some doubts on SLAA512--《Using TI Technology to Simplify Bluetooth Pairing Via NFC》

Hi everyone,

I am a new guy on RFID\NFC,and   I'm pluzzed by Ti's describtion when i look over  page22 on SLAA512.

I don't know why a prefixed byte "0x02" or "0x03" turns up her. so  I  look over <NFCForum-TS-Type-4-Tag_2.0>  .

and I found there 's no demand of a prefixed byte '0x02' 0r '0x03'  during the NDEF detection procedure.

so ,  I have 2 questions need some one to help .

1st)  Why TI  add the prefixed byte '0x02'/ '0x03'  on here?

2nd) If TI add this prefixed byte ,it sound like incompatible with  <NFCForum-TS-Type-4-Tag_2.0> . Can some one explain this?

Thanks.