496 struct	roff_node {  struct
497 	struct roff_node *parent;  /* Parent AST node. */  argument
498 	struct roff_node *child;   /* First child AST node. */  argument
499 	struct roff_node *last;    /* Last child AST node. */  argument
500 	struct roff_node *next;    /* Sibling AST node. */  argument
501 	struct roff_node *prev;    /* Prior sibling AST node. */  argument
502 	struct roff_node *head;    /* BLOCK */  argument
503 	struct roff_node *body;    /* BLOCK/ENDBODY */  argument
504 	struct roff_node *tail;    /* BLOCK */  argument
533 	struct roff_node *first;   /* The first node parsed. */  argument
552 void		 deroff(char **, const struct roff_node *);