nfcv tags are generally ndef-formatted tags with a stronger signal range.
those that are not would have no reason not to be unless data are stored in a proprietary
manner, in which case reading returns garbage without the schema and, possibly,
any encryption keys. the nfc library is designed for tags supporting ndef. reading non-
ndef tags would have nothing to do with the library. android's support for nfc,
while somewhat good, has limitations when it comes to non-ndef tags. without revealing any
non-disclosure agreements you may have, what's the story?