+ // Platform.timeCheck("ESP. getxref + " + (i) + "/" + n,
+ // Platform.TIME_MARK);
+ // BH 2019.01.25 this next method was taking 174 ms PER addition for a
+ // 266-reference example.
+ // DBRefUtils.ensurePrimaries(seq)
+ // was at the end of seq.addDBRef, so executed after ever addition!
+ // This method was moved to seq.getPrimaryDBRefs()
+ seq.addDBRef(xrefs.get(i));