497 struct	roff_node {  struct
498 	struct roff_node *parent;  /* Parent AST node. */  argument
499 	struct roff_node *child;   /* First child AST node. */  argument
500 	struct roff_node *last;    /* Last child AST node. */  argument
501 	struct roff_node *next;    /* Sibling AST node. */  argument
502 	struct roff_node *prev;    /* Prior sibling AST node. */  argument
503 	struct roff_node *head;    /* BLOCK */  argument
504 	struct roff_node *body;    /* BLOCK/ENDBODY */  argument
505 	struct roff_node *tail;    /* BLOCK */  argument
537 	struct roff_node *first;   /* The first node parsed. */  argument
556 void		  deroff(char **, const struct roff_node *);
557 struct roff_node *roff_node_child(struct roff_node *);
558 struct roff_node *roff_node_next(struct roff_node *);
559 struct roff_node *roff_node_prev(struct roff_node *);
560 int		  roff_node_transparent(struct roff_node *);