diff -ur v34/ezmd.py v35/ezmd.py
--- v34/ezmd.py	2019-10-13 23:34:07.000000000 +0900
+++ v35/ezmd.py	2019-10-15 20:11:07.000000000 +0900
@@ -163,9 +163,11 @@
 	n = 1 if is_lst(o) else len(delim)
 	return ( o[:i], o[i+n:] )
 
+str_types = (str, unicode) if six.PY2 else (str,)
+
 is_lst = lambda o: type(o) == list
 is_tag = lambda o: isinstance(o, Empty) # !!!
-is_str = lambda o: not is_lst(o) and not is_tag(o)
+is_str = lambda o: not is_lst(o) and not is_tag(o) and type(o) in str_types
 lst_strip_is_str = lambda lst: list( map( lambda o: o.strip() if is_str(o) else o, lst ) )
 
 def delim_pop(o, delim):
@@ -600,7 +602,7 @@
 	add_k = '__ADD__'
 	add_d = d.pop(add_k) if add_k in d else {}
 
-	cv = lambda o: list( map(cv, o) ) if is_lst(o) else str(o)
+	cv = lambda o: list( map(cv, o) ) if is_lst(o) else ( o if is_str(o) else str(o) )
 	d = dict( map( lambda kv: list( map(cv, kv) ), d.items() ) )
 	targ.update(d)
 	d = dict( filter( lambda kv: kv[0] != kv[1], targ.items() ) )
@@ -608,23 +610,31 @@
 	for (k, v) in add_d.items():
 		if k in d:
 			dv = d.get(k)
-			v = dv + v if str(dv) and is_str(v) else to_str(dv) + to_str(v)
+			v = dv + v if is_str(dv) and is_str(v) else to_str(dv) + to_str(v)
 		d[k] = v
 
 	targ.clear()
 	targ.update(d)
 
 def do_macro(buf):
-	for (k, v) in macro_dic.items():
-		def f(s):
-			if k in s:
-				if is_str(v):
-					return s.replace(k, v)
-				if is_lst(v):
-					lst = list( map( lambda a: [a] if a else [], s.split(k) ) )
-					return sum( map( lambda b: b+v, lst[:-1] ), [] ) + lst[-1]
-			return s
-		buf = flat_map(f, buf)
+	def f_dic(buf):
+		for (k, v) in macro_dic.items():
+			def f(s):
+				if k in s:
+					if is_str(v):
+						return s.replace(k, v)
+					if is_lst(v):
+						lst = list( map( lambda a: [a] if a else [], s.split(k) ) )
+						return sum( map( lambda b: b+v, lst[:-1] ), [] ) + lst[-1]
+				return s
+			buf = flat_map(f, buf)
+		return buf
+
+	for i in range(20):
+		bak = buf
+		buf = f_dic(buf)
+		if buf == bak:
+			break
 	return buf
 
 def do_mode(mode, buf, hd_names):
@@ -769,7 +779,7 @@
 	if is_lst(o):
 		return list( map(rm_nl_tag, o) )
 	# o is tag
-	if o.name != 'pre':
+	if o.name not in ('pre', 'yaml') :
 		o.v = rm_nl_tag(o.v)
 	return o