diff --git a/ase/awk/awk.c b/ase/awk/awk.c
index 61005019..f167f71a 100644
--- a/ase/awk/awk.c
+++ b/ase/awk/awk.c
@@ -96,8 +96,19 @@ ase_awk_t* ase_awk_open (const ase_awk_prmfns_t* prmfns, void* custom_data)
 		return ASE_NULL;	
 	}
 
+	if (ase_awk_tab_open (&awk->parse.afns, awk) == ASE_NULL)
+	{
+		ase_awk_map_close (awk->tree.afns);
+		ase_awk_map_close (awk->rwtab);
+		ase_awk_map_close (awk->wtab);
+		ase_str_close (&awk->token.name);
+		ASE_AWK_FREE (awk, awk);
+		return ASE_NULL;	
+	}
+
 	if (ase_awk_tab_open (&awk->parse.globals, awk) == ASE_NULL) 
 	{
+		ase_awk_tab_close (&awk->parse.afns);
 		ase_awk_map_close (awk->tree.afns);
 		ase_awk_map_close (awk->rwtab);
 		ase_awk_map_close (awk->wtab);
@@ -109,6 +120,7 @@ ase_awk_t* ase_awk_open (const ase_awk_prmfns_t* prmfns, void* custom_data)
 	if (ase_awk_tab_open (&awk->parse.locals, awk) == ASE_NULL) 
 	{
 		ase_awk_tab_close (&awk->parse.globals);
+		ase_awk_tab_close (&awk->parse.afns);
 		ase_awk_map_close (awk->tree.afns);
 		ase_awk_map_close (awk->rwtab);
 		ase_awk_map_close (awk->wtab);
@@ -121,6 +133,7 @@ ase_awk_t* ase_awk_open (const ase_awk_prmfns_t* prmfns, void* custom_data)
 	{
 		ase_awk_tab_close (&awk->parse.locals);
 		ase_awk_tab_close (&awk->parse.globals);
+		ase_awk_tab_close (&awk->parse.afns);
 		ase_awk_map_close (awk->tree.afns);
 		ase_awk_map_close (awk->rwtab);
 		ase_awk_map_close (awk->wtab);
@@ -168,6 +181,7 @@ ase_awk_t* ase_awk_open (const ase_awk_prmfns_t* prmfns, void* custom_data)
 		ase_awk_tab_close (&awk->parse.params);
 		ase_awk_tab_close (&awk->parse.locals);
 		ase_awk_tab_close (&awk->parse.globals);
+		ase_awk_tab_close (&awk->parse.afns);
 		ase_awk_map_close (awk->tree.afns);
 		ase_awk_map_close (awk->rwtab);
 		ase_awk_map_close (awk->wtab);
@@ -195,6 +209,7 @@ ase_awk_t* ase_awk_open (const ase_awk_prmfns_t* prmfns, void* custom_data)
 		ase_awk_tab_close (&awk->parse.params);
 		ase_awk_tab_close (&awk->parse.locals);
 		ase_awk_tab_close (&awk->parse.globals);
+		ase_awk_tab_close (&awk->parse.afns);
 		ase_awk_map_close (awk->tree.afns);
 		ase_awk_map_close (awk->rwtab);
 		ase_awk_map_close (awk->wtab);
@@ -239,9 +254,12 @@ int ase_awk_close (ase_awk_t* awk)
 	ase_awk_tab_close (&awk->parse.params);
 	ase_awk_tab_close (&awk->parse.locals);
 	ase_awk_tab_close (&awk->parse.globals);
+	ase_awk_tab_close (&awk->parse.afns);
+
 	ase_awk_map_close (awk->tree.afns);
 	ase_awk_map_close (awk->rwtab);
 	ase_awk_map_close (awk->wtab);
+
 	ase_str_close (&awk->token.name);
 
 	for (i = 0; i < ASE_COUNTOF(awk->errstr); i++)
@@ -279,6 +297,7 @@ int ase_awk_clear (ase_awk_t* awk)
 
 	ase_awk_tab_clear (&awk->parse.locals);
 	ase_awk_tab_clear (&awk->parse.params);
+	ase_awk_tab_clear (&awk->parse.afns);
 
 	awk->parse.nlocals_max = 0; 
 	awk->parse.depth.cur.block = 0;
diff --git a/ase/awk/awk.h b/ase/awk/awk.h
index c53adeaa..488ffa5e 100644
--- a/ase/awk/awk.h
+++ b/ase/awk/awk.h
@@ -159,8 +159,8 @@ enum ase_awk_option_t
 	/* allow undeclared variables and implicit concatenation */
 	ASE_AWK_IMPLICIT    = (1 << 0),
 
-	/* allow explicit variable declaration and the concatenation
-	 * operator, a period. */
+	/* allow explicit variable declaration, the concatenation
+	 * operator(.), and a parse-time function check. */
 	ASE_AWK_EXPLICIT    = (1 << 1), 
 
 	/* a function name should not coincide to be a variable name */
diff --git a/ase/awk/awk_i.h b/ase/awk/awk_i.h
index 70f9d540..91210ad7 100644
--- a/ase/awk/awk_i.h
+++ b/ase/awk/awk_i.h
@@ -117,13 +117,24 @@ struct ase_awk_t
 			} max;
 		} depth;
 
+		/* function calls */
+		ase_awk_tab_t afns;
+
+		/* global variables */
 		ase_awk_tab_t globals;
+
+		/* local variables */
 		ase_awk_tab_t locals;
+
+		/* parameters to a function */
 		ase_awk_tab_t params;
+
+		/* maximum number of local variables */
 		ase_size_t nlocals_max;
 
 		ase_awk_nde_t* (*parse_block) (
 			ase_awk_t*,ase_size_t,ase_bool_t);
+
 	} parse;
 
 	/* source code management */
@@ -171,7 +182,6 @@ struct ase_awk_t
 	struct
 	{
 		ase_awk_bfn_t* sys;
-		/*ase_awk_bfn_t* user;*/
 		ase_awk_map_t* user;
 	} bfn;
 
diff --git a/ase/awk/parse.c b/ase/awk/parse.c
index d99d8f33..53cef365 100644
--- a/ase/awk/parse.c
+++ b/ase/awk/parse.c
@@ -519,9 +519,30 @@ static int parse (ase_awk_t* awk)
 				goto exit_parse;
 			}
 		}
+
+		if (awk->option & ASE_AWK_EXPLICIT)
+		{
+			ase_size_t sz;
+
+			sz = awk->parse.afns.size;
+			while (sz > 0)
+			{
+				sz--;
+
+				if (ase_awk_map_get (awk->tree.afns, 
+					awk->parse.afns.buf[sz].name.ptr,
+					awk->parse.afns.buf[sz].name.len) == ASE_NULL)
+				{
+					/* TODO: set proper error number */
+					SETERR (awk, ASE_AWK_EINVAL);	
+					n = -1;
+					goto exit_parse;	
+				}
+			}
+		}
 	}
 
-	ASE_ASSERT (awk->tree.nglobals == ase_awk_tab_getsize(&awk->parse.globals));
+	ASE_ASSERT (awk->tree.nglobals == awk->parse.globals.size);
 
 	if (awk->src.ios.out != ASE_NULL) 
 	{
@@ -1421,8 +1442,7 @@ static int add_global (
 		}
 
 		/* check if it conflict with a function name */
-		if (ase_awk_map_get (
-			awk->tree.afns, name, len) != ASE_NULL) 
+		if (ase_awk_map_get (awk->tree.afns, name, len) != ASE_NULL) 
 		{
 			SETERRARG (
 				awk, ASE_AWK_EAFNRED, line, 
@@ -3129,7 +3149,7 @@ static ase_awk_nde_t* parse_primary_ident (ase_awk_t* awk, ase_size_t line)
 				}
 
 				/* check if it is an AWK function */
-				if (ase_awk_map_get(awk->tree.afns, name_dup, name_len) != ASE_NULL) 
+				if (ase_awk_map_get (awk->tree.afns, name_dup, name_len) != ASE_NULL) 
 				{
 					/* the function is defined previously */
 					SETERRARG (awk, ASE_AWK_EAFNRED, line, name_dup, name_len);
@@ -3282,7 +3302,7 @@ static ase_awk_nde_t* parse_hashidx (
 			}
 
 			/* check if it is an AWK function */
-			if (ase_awk_map_get(awk->tree.afns, name, name_len) != ASE_NULL) 
+			if (ase_awk_map_get (awk->tree.afns, name, name_len) != ASE_NULL) 
 			{
 				/* the function is defined previously */
 				SETERRARG (awk, ASE_AWK_EAFNRED, line, name, name_len);
@@ -3422,6 +3442,15 @@ static ase_awk_nde_t* parse_fncall (
 		call->what.afn.name.len = name_len;
 		call->args = head;
 		call->nargs = nargs;
+
+		if ((awk->option & ASE_AWK_EXPLICIT) &&
+		    ase_awk_tab_adduniq (&awk->parse.afns, name, name_len) == (ase_size_t)-1)
+		{
+			ASE_AWK_FREE (awk, call);
+			if (head != ASE_NULL) ase_awk_clrpt (awk, head);
+			SETERRLIN (awk, ASE_AWK_ENOMEM, line);
+			return ASE_NULL;
+		}
 	}
 
 	return (ase_awk_nde_t*)call;
diff --git a/ase/awk/tab.c b/ase/awk/tab.c
index 6fd3706d..2df4d291 100644
--- a/ase/awk/tab.c
+++ b/ase/awk/tab.c
@@ -186,6 +186,17 @@ ase_size_t ase_awk_tab_add (
 	return ase_awk_tab_insert (tab, tab->size, str, len);
 }
 
+ase_size_t ase_awk_tab_adduniq (
+	ase_awk_tab_t* tab, const ase_char_t* str, ase_size_t len)
+{
+	ase_size_t i;
+	i = ase_awk_tab_find (tab, 0, str, len);
+	if (i != (ase_size_t)-1) return i; /* found. return the current index */
+
+	/* insert a new entry */
+	return ase_awk_tab_insert (tab, tab->size, str, len);
+}
+
 ase_size_t ase_awk_tab_find (
 	ase_awk_tab_t* tab, ase_size_t index, 
 	const ase_char_t* str, ase_size_t len)
diff --git a/ase/awk/tab.h b/ase/awk/tab.h
index a2a071fa..d7462865 100644
--- a/ase/awk/tab.h
+++ b/ase/awk/tab.h
@@ -54,6 +54,8 @@ ase_size_t ase_awk_tab_remove (
 
 ase_size_t ase_awk_tab_add (
 	ase_awk_tab_t* tab, const ase_char_t* str, ase_size_t len);
+ase_size_t ase_awk_tab_adduniq (
+	ase_awk_tab_t* tab, const ase_char_t* str, ase_size_t len);
 
 ase_size_t ase_awk_tab_find (
 	ase_awk_tab_t* tab, ase_size_t index,
diff --git a/ase/rel/doc.awk b/ase/rel/doc.awk
index 18f15a37..eccf91c0 100644
--- a/ase/rel/doc.awk
+++ b/ase/rel/doc.awk
@@ -9,7 +9,7 @@ global empty_line_count;
 global para_started;
 global list_count;
 
-func print_text (full)
+function print_text (full)
 {
 	local fra1, fra2, link, idx, t1, t2;
 
diff --git a/ase/rel/rel.sh b/ase/rel/rel.sh
index 1b2c8b71..c370b2b5 100755
--- a/ase/rel/rel.sh
+++ b/ase/rel/rel.sh
@@ -44,12 +44,12 @@ finalize ()
 
 			case "$i" in
 			*.h|*.c|*.cc|*.cpp|*.java|*.awk|*.in)
-				"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/lic.awk" -a "$target/$file" "$full"
+				"$ASEAWK" -f "$BASE/rel/lic.awk" -a "$target/$file" "$full"
 				;;
 			*.man)
 				html=`echo $i | sed 's/.man$/.html/'`
 				"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/doc.awk" "$full" > "$SOURCE_ROOT/html/$html"
-				"$ASEAWK" -explicit -f "$BASE/rel/doc.awk" "$full" > "$ASETGT/$html"
+				"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/doc.awk" "$full" > "$ASETGT/$html"
 				cp -f "$full" "$target/$file"
 				;;
 			*.css)
@@ -58,10 +58,10 @@ finalize ()
 				cp -f "$full" "$ASETGT/$i"
 				;;
 			*.dsp|*.dsw|*.sln|*.vcproj|*.csproj|*.bat|*.cmd)
-				"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
+				"$ASEAWK" -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
 				;;
 			descrip.mms)
-				"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
+				"$ASEAWK" -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
 				;;
 			*.frx)
 				cp -f "$full" "$target/$file"
@@ -69,7 +69,7 @@ finalize ()
 			*)
 				if [ "$dir" = "test/com" ]
 				then
-					"$ASEAWK" -explicit -noimplicit -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
+					"$ASEAWK" -f "$BASE/rel/unix2dos.awk" "$full" > "$target/$file"	
 				else
 					cp -f "$full" "$target/$file"
 				fi