code: function encodeXREF( encoder, id ) {
  
  	// Write opcode for 16-bit lookup 
  	encoder.log(LOG.XREF, "xref="+id+" [" + encoder.stringLookup[id] + "]")
  	encoder.stream8.write( pack1b( PRIM_OP.IMPORT, false ) );
  	encoder.stream16.write( pack2b( id, false ) );
  	encoder.counters.op_xref+=3;
  
  }
docs: Encode an 16-bit X-REF opcode