parse tree node types

Macros
#define	PT_AND   5
#define	PT_CONSTANT   3
#define	PT_EMPTY   0
#define	PT_EQUALS   8
#define	PT_EQUIV   9
#define	PT_GE   13 /* greater than or equal to, i.e., ">=" */
#define	PT_GT   11 /* greater than, i.e., ">" */
#define	PT_IMPLIES   7
#define	PT_LE   12 /* less than or equal to, i.e., "<=" */
#define	PT_LT   10 /* less than, i.e., "<" */
#define	PT_NEG   4
#define	PT_NEXT_VARIABLE   2
#define	PT_NOTEQ   14 /* not equals */
#define	PT_OR   6
#define	PT_VARIABLE   1

Detailed Description