RE: SWP?
https://www.zdnetasia.com/insight/communications/0,39044835,61987828,00.htm
Too Complex? (Read the complete article)
Jean-François Durix, NFC product marketing manager with NXP, argues SWP increases complexity in NFC phones, which is not good for a standard. He contends SWP got the nod from the French operators only because it was the most mature single-wire proposal available at the time. NXP had yet to submit its new proposal.