NFC Type 4 Applet
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NFC Forum describes officially currently 4 tags able to store NDEF messages.
Amongst them, NFC Forum Type 4 Tag Operation Specification 2.0 (November 2010):
Type 4 Tag is fully compatible with the ISO/IEC 14443 standard series. Tags are pre-configured at manufacture to be either read and re-writable, or read-only. The memory availability is variable, up to 32 KBytes per service; the communication interface is either Type A or Type B compliant.
Spec is freely available but upon licensing terms agreement.
A DESFire can be used as NFC Type 4 Tag according to this application note but any card speaking ISO14443-4 type A or B can potentially become a NFC Tag.
This page describes how to use a NXP SmartMX with JCOP as NFC Forum Type 4 Tag.