===================================================================
RCS file: /cvs/mandoc/mandoc.h,v
retrieving revision 1.79
retrieving revision 1.83
diff -u -p -r1.79 -r1.83
--- mandoc/mandoc.h	2011/07/17 12:52:54	1.79
+++ mandoc/mandoc.h	2011/07/21 11:34:53	1.83
@@ -1,4 +1,4 @@
-/*	$Id: mandoc.h,v 1.79 2011/07/17 12:52:54 kristaps Exp $ */
+/*	$Id: mandoc.h,v 1.83 2011/07/21 11:34:53 kristaps Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  *
@@ -109,6 +109,10 @@ enum	mandocerr {
 
 	MANDOCERR_ERROR, /* ===== start of errors ===== */
 
+	/* related to equations */
+	MANDOCERR_EQNARGS, /* bad equation macro arguments */
+	MANDOCERR_EQNNEST, /* too many nested equation defines */
+
 	/* related to tables */
 	MANDOCERR_TBL, /* bad table syntax */
 	MANDOCERR_TBLOPT, /* bad table option */
@@ -273,10 +277,21 @@ struct	tbl_span {
 	struct tbl_span	 *next;
 };
 
+enum	eqn_boxt {
+	EQN_ROOT,
+	EQN_TEXT
+};
+
+struct	eqn_box {
+	enum eqn_boxt	  type;
+	struct eqn_box	 *child;
+	struct eqn_box	 *next;
+	char		 *text;
+};
+
 struct	eqn {
-	size_t		  sz;
-	char		 *data;
-	int		  line; /* invocation line */
+	struct eqn_box	 *root;
+	int		  ln; /* invocation line */
 	int		  pos; /* invocation position */
 };