By coincidence, in support of what I wrote above:-
Today's news report (see below) explains the latest state-of-play as regards the SSPX.
Neither side (Vatican, SSPX) had been thinking that "The SSPX is in schism" (pace 'Marty E'). 
And, as today's report shows, the SSPX is now moving back towards full communion - via the 'Personal Prelature' route.
http://www.lastampa.it/2017/01/30/vaticaninsider/eng/the-vatican/fraternity-of-st-pius-x-ever-closer-to-reconciliation-xY7GVwCDVyST373inFczcP/pagina.html