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
505 	struct mdoc_arg	 *args;    /* BLOCK/ELEM */
506 	union mdoc_data	 *norm;    /* Normalized arguments. */
507 	char		 *string;  /* TEXT */
508 	struct tbl_span	 *span;    /* TBL */
509 	struct eqn_box	 *eqn;     /* EQN */
533 	struct roff_node *first;   /* The first node parsed. */  argument