diff --git a/lib/cnode.c b/lib/cnode.c
new file mode 100644
index 0000000..eadfb80
--- /dev/null
+++ b/lib/cnode.c
@@ -0,0 +1,81 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2016-2018 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+static hcl_cnode_t* make_cnode (hcl_t* hcl, hcl_cnode_type_t type, const hcl_ioloc_t* loc, hcl_oow_t extra_space)
+{
+	hcl_cnode_t* cnode;
+
+	cnode = hcl_allocmem(hcl, HCL_SIZEOF(*cnode) + extra_space);
+	if (HCL_UNLIKELY(!cnode)) return HCL_NULL;
+
+	cnode->type = type;
+	cnode->loc = *loc;
+	return cnode;
+}
+
+hcl_cnode_t* hcl_makecnodenil (hcl_t* hcl, const hcl_ioloc_t* loc)
+{
+	return make_cnode(hcl, HCL_CNODE_NIL, loc, 0);
+}
+
+hcl_cnode_t* hcl_makecnodetrue (hcl_t* hcl, const hcl_ioloc_t* loc)
+{
+	return make_cnode(hcl, HCL_CNODE_TRUE, loc, 0);
+}
+
+hcl_cnode_t* hcl_makecnodefalse (hcl_t* hcl, const hcl_ioloc_t* loc)
+{
+	return make_cnode(hcl, HCL_CNODE_FALSE, loc, 0);
+}
+
+hcl_cnode_t* hcl_makecnodecharlit (hcl_t* hcl, const hcl_ioloc_t* loc, const hcl_ooch_t ch)
+{
+	hcl_cnode_t* c =  make_cnode(hcl, HCL_CNODE_CHARLIT, loc, 0);
+	if (HCL_UNLIKELY(!c)) return HCL_NULL;
+	c->u.charlit.v = ch;
+	return c;
+}
+
+hcl_cnode_t* hcl_makecnodestrlit (hcl_t* hcl, const hcl_ioloc_t* loc, const hcl_ooch_t* ptr, hcl_oow_t len)
+{
+	hcl_cnode_t* c =  make_cnode(hcl, HCL_CNODE_STRLIT, loc, HCL_SIZEOF(*ptr) * (len + 1));
+	if (HCL_UNLIKELY(!c)) return HCL_NULL;
+
+	c->u.strlit.ptr = (hawk_ooch_t*)(c + 1);
+	c->u.strlit.len = len;
+	hawk_copy_bchars (c->u.strlit.ptr, c->u.strlit.len, ptr, len);	
+	return c;
+}
+
+hcl_cnode_t* hcl_makecnodeerrlit (hcl_t* hcl, const hcl_ioloc_t* loc, hcl_ooi_t v)
+{
+	hcl_cnode_t* c =  make_cnode(hcl, HCL_CNODE_ERRLIT, loc, HCL_SIZEOF(*ptr) * (len + 1));
+	if (HCL_UNLIKELY(!c)) return HCL_NULL;
+
+	c->u.errlit.v = v;
+	return c;
+}
+
diff --git a/lib/hcl-prv.h b/lib/hcl-prv.h
index 6510ec5..ce06fb6 100644
--- a/lib/hcl-prv.h
+++ b/lib/hcl-prv.h
@@ -140,7 +140,7 @@ enum hcl_iotok_type_t
 	HCL_IOTOK_RADNUMLIT,
 	HCL_IOTOK_FPDECLIT,
 	HCL_IOTOK_SMPTRLIT,
-	HCL_IOTOK_ERRORLIT,
+	HCL_IOTOK_ERRLIT,
 	HCL_IOTOK_NIL,
 	HCL_IOTOK_TRUE,
 	HCL_IOTOK_FALSE,
@@ -181,7 +181,6 @@ struct hcl_iolink_t
 	hcl_iolink_t* link;
 };
 
-typedef enum hcl_concode_t hcl_concode_t;
 enum hcl_cnode_type_t
 {
 	HCL_CNODE_CHARLIT,
@@ -190,7 +189,7 @@ enum hcl_cnode_type_t
 	HCL_CNODE_RADNUMLIT,
 	HCL_CNODE_FPDECLIT,
 	HCL_CNODE_SMPTRLIT,
-	HCL_CNODE_ERRORLIT,
+	HCL_CNODE_ERRLIT,
 	HCL_CNODE_NIL,
 	HCL_CNODE_TRUE,
 	HCL_CNODE_FALSE,
@@ -226,11 +225,19 @@ struct hcl_cnode_t
 
 	union
 	{
+		struct
+		{
+			hcl_ooch_t v;
+		} charlit;
 		struct
 		{
 			hcl_ooch_t* ptr;
 			hcl_oow_t len;
 		} strlit;
+		struct
+		{
+			hcl_ooi_t v;
+		} errlit;
 	} u;
 };
 typedef struct hcl_cnode_t hcl_cnode_t;
diff --git a/lib/hcl.h b/lib/hcl.h
index 35d34b0..a1550a2 100644
--- a/lib/hcl.h
+++ b/lib/hcl.h
@@ -103,7 +103,7 @@ enum hcl_synerrnum_t
 	HCL_SYNERR_CHARLIT,       /* wrong character literal */
 	HCL_SYNERR_NUMLIT ,       /* invalid numeric literal */
 	HCL_SYNERR_NUMRANGE,      /* number range error */
-	HCL_SYNERR_ERRORLIT,      /* wrong error literal */
+	HCL_SYNERR_ERRLIT,        /* wrong error literal */
 	HCL_SYNERR_SMPTRLIT,      /* wrong smptr literal */
 	HCL_SYNERR_MSEGIDENT,     /* wrong multi-segment identifier */
 
diff --git a/lib/read.c b/lib/read.c
index bddf15f..e5bd6bb 100644
--- a/lib/read.c
+++ b/lib/read.c
@@ -799,7 +799,7 @@ static int get_sharp_token (hcl_t* hcl)
 
 		case 'e':
 			if (get_radix_number(hcl, c, 10) <= -1) return -1;
-			SET_TOKEN_TYPE (hcl, HCL_IOTOK_ERRORLIT);
+			SET_TOKEN_TYPE (hcl, HCL_IOTOK_ERRLIT);
 			break;
 
 		case 'p':
@@ -2030,7 +2030,7 @@ static int read_object (hcl_t* hcl)
 				break;
 			}
 
-			case HCL_IOTOK_ERRORLIT:
+			case HCL_IOTOK_ERRLIT:
 			{
 				hcl_oow_t i;
 				hcl_ooi_t v = 0;
@@ -2043,7 +2043,7 @@ static int read_object (hcl_t* hcl)
 
 					if (v > HCL_ERROR_MAX)
 					{
-						hcl_setsynerr (hcl, HCL_SYNERR_ERRORLIT, TOKEN_LOC(hcl), TOKEN_NAME(hcl));
+						hcl_setsynerr (hcl, HCL_SYNERR_ERRLIT, TOKEN_LOC(hcl), TOKEN_NAME(hcl));
 						return -1;
 					}
 				}