From: slkpg4@gmail.com   
      
    From https://en.wikipedia.org/wiki/XPL   
      
   "XCOM and XA were subsequently changed to instead use a variant of Donald   
   Knuth's LR parser bottom-up method.[4] XCOM's variant is called Simple LR   
   or SLR. It handles more grammars than MSP but not quite as many grammars   
   as LALR or full LR(1). The differences from LR(1) are mostly in the table   
   generator's algorithms, not in the compile-time parser method. XCOM and XA   
   predate the widespread availability of Unix and its yacc parser generator   
   tool. XA and yacc have similar purposes."   
      
   I would suggest using LR, given the power of today's hardware. SLK   
   generates LR(k) and it was much easier for me to implement than the   
   LALR(k) that is also supported.   
      
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