var CONST = 0, UNARY = 1, BINARY = 2, INFIX = 3, LEFTBRACKET = 4, 
      RIGHTBRACKET = 5, SPACE = 6, UNDEROVER = 7, DEFINITION = 8,
      LEFTRIGHT = 9, TEXT = 10; // token types
  
  var AMsqrt = {input:"sqrt", tag:"msqrt", output:"sqrt", tex:null, ttype:UNARY},
    AMroot  = {input:"root", tag:"mroot", output:"root", tex:null, ttype:BINARY},
    AMfrac  = {input:"frac", tag:"mfrac", output:"/",    tex:null, ttype:BINARY},
    AMdiv   = {input:"/",    tag:"mfrac", output:"/",    tex:null, ttype:INFIX},
    AMover  = {input:"stackrel", tag:"mover", output:"stackrel", tex:null, ttype:BINARY},
    AMsub   = {input:"_",    tag:"msub",  output:"_",    tex:null, ttype:INFIX},
    AMsup   = {input:"^",    tag:"msup",  output:"^",    tex:null, ttype:INFIX},
    AMtext  = {input:"text", tag:"mtext", output:"text", tex:null, ttype:TEXT},
    AMmbox  = {input:"mbox", tag:"mtext", output:"mbox", tex:null, ttype:TEXT},
    AMquote = {input:"\"",   tag:"mtext", output:"mbox", tex:null, ttype:TEXT};