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
506 	struct mdoc_arg	 *args;    /* BLOCK/ELEM */
507 	union mdoc_data	 *norm;    /* Normalized arguments. */
508 	char		 *string;  /* TEXT */
509 	char		 *tag;     /* For less(1) :t and HTML id=. */
510 	struct tbl_span	 *span;    /* TBL */
511 	struct eqn_box	 *eqn;     /* EQN */
512 	int		  line;    /* Input file line number. */
513 	int		  pos;     /* Input file column number. */
537 	struct roff_node *first;   /* The first node parsed. */  argument