diff --git a/Makefile.am b/Makefile.am
index 24de4f1..69a1a27 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -3,7 +3,14 @@ ACLOCAL_AMFLAGS = -I m4
 
 EXTRA_DIST =
 
-SUBDIRS = lib
+SUBDIRS =
+
+if ENABLE_STATIC_MODULE
+SUBDIRS += mod lib
+else
+SUBDIRS += lib mod
+endif
+
 DIST_SUBDIRS = $(SUBDIRS) 
 
 distclean-local:
diff --git a/Makefile.in b/Makefile.in
index 87e5308..2f69e58 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -87,6 +87,8 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
+@ENABLE_STATIC_MODULE_TRUE@am__append_1 = mod lib
+@ENABLE_STATIC_MODULE_FALSE@am__append_2 = lib mod
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_namespace.m4 \
@@ -163,8 +165,8 @@ am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/ac/ar-lib \
 	$(top_srcdir)/ac/compile $(top_srcdir)/ac/config.guess \
 	$(top_srcdir)/ac/config.sub $(top_srcdir)/ac/install-sh \
 	$(top_srcdir)/ac/ltmain.sh $(top_srcdir)/ac/missing ac/ar-lib \
-	ac/compile ac/config.guess ac/config.sub ac/depcomp \
-	ac/install-sh ac/ltmain.sh ac/missing
+	ac/compile ac/config.guess ac/config.sub ac/install-sh \
+	ac/ltmain.sh ac/missing
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -354,7 +356,7 @@ top_srcdir = @top_srcdir@
 AUTOMAKE_OPTION = foreign
 ACLOCAL_AMFLAGS = -I m4
 EXTRA_DIST = 
-SUBDIRS = lib
+SUBDIRS = $(am__append_1) $(am__append_2)
 DIST_SUBDIRS = $(SUBDIRS) 
 all: all-recursive
 
diff --git a/configure b/configure
index 10221b0..3f03d15 100755
--- a/configure
+++ b/configure
@@ -19439,7 +19439,7 @@ HCL_PROJECT_AUTHOR="${PACKAGE_BUGREPORT}"
 HCL_PROJECT_URL="${PACKAGE_URL}"
 
 
-ac_config_files="$ac_config_files Makefile lib/Makefile"
+ac_config_files="$ac_config_files Makefile lib/Makefile mod/Makefile"
 
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
@@ -20578,6 +20578,7 @@ do
     "libtool") CONFIG_COMMANDS="$CONFIG_COMMANDS libtool" ;;
     "Makefile") CONFIG_FILES="$CONFIG_FILES Makefile" ;;
     "lib/Makefile") CONFIG_FILES="$CONFIG_FILES lib/Makefile" ;;
+    "mod/Makefile") CONFIG_FILES="$CONFIG_FILES mod/Makefile" ;;
 
   *) as_fn_error $? "invalid argument: \`$ac_config_target'" "$LINENO" 5;;
   esac
diff --git a/configure.ac b/configure.ac
index b2f132a..fd6a584 100644
--- a/configure.ac
+++ b/configure.ac
@@ -465,6 +465,7 @@ AC_SUBST(HCL_PROJECT_URL, "${PACKAGE_URL}")
 AC_CONFIG_FILES([
 	Makefile 
 	lib/Makefile 
+	mod/Makefile 
 ])
 AC_OUTPUT
 
diff --git a/lib/Makefile.am b/lib/Makefile.am
index d6034d5..b638113 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -5,7 +5,12 @@ CPPFLAGS_ALL_COMMON = \
 	-I$(abs_srcdir) \
 	-I$(includedir)	
 
+if ENABLE_STATIC_MODULE
+LDFLAGS_ALL_COMMON = -L$(abs_builddir)/../mod -L$(abs_builddir) -L$(libdir)
+else
 LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(libdir)
+endif
+
 
 ##################################################
 # MAIN LIBRARY 
@@ -60,13 +65,29 @@ libhcl_la_SOURCES = \
 libhcl_la_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 libhcl_la_LDFLAGS = $(LDFLAGS_LIB_COMMON)
 libhcl_la_LIBADD = $(LIBADD_LIB_COMMON)
+libhcl_la_DEPENDENCIES =
+
+if ENABLE_STATIC_MODULE
+
+libhcl_la_LIBADD += -lhcl-arr
+libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-arr.la
+libhcl_la_LIBADD += -lhcl-dic
+libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-dic.la
+libhcl_la_LIBADD += -lhcl-str
+libhcl_la_DEPENDENCIES += $(abs_builddir)/../mod/libhcl-str.la
+endif
+
 
 bin_PROGRAMS = hcl
 hcl_SOURCES = main.c
 hcl_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 hcl_LDFLAGS = $(LDFLAGS_LIB_COMMON)
 hcl_LDADD = $(LIBADD_LIB_COMMON) -lhcl #-ldyncall_s
+
+if ENABLE_STATIC_MODULE
 hcl_DEPENDENCIES = libhcl.la
+endif
+
 
 
 install-data-hook:
diff --git a/lib/Makefile.in b/lib/Makefile.in
index bc91e4c..8c2ccc0 100644
--- a/lib/Makefile.in
+++ b/lib/Makefile.in
@@ -88,7 +88,13 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
+@ENABLE_STATIC_MODULE_TRUE@am__append_1 = -lhcl-arr -lhcl-dic \
+@ENABLE_STATIC_MODULE_TRUE@	-lhcl-str
+@ENABLE_STATIC_MODULE_TRUE@am__append_2 = $(abs_builddir)/../mod/libhcl-arr.la \
+@ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-dic.la \
+@ENABLE_STATIC_MODULE_TRUE@	$(abs_builddir)/../mod/libhcl-str.la
 bin_PROGRAMS = hcl$(EXEEXT)
+@ENABLE_STATIC_MODULE_FALSE@hcl_DEPENDENCIES = $(am__DEPENDENCIES_2)
 subdir = lib
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/m4/ax_cxx_namespace.m4 \
@@ -136,7 +142,6 @@ am__installdirs = "$(DESTDIR)$(pkglibdir)" "$(DESTDIR)$(bindir)" \
 LTLIBRARIES = $(pkglib_LTLIBRARIES)
 am__DEPENDENCIES_1 =
 am__DEPENDENCIES_2 = $(am__DEPENDENCIES_1) $(am__DEPENDENCIES_1)
-libhcl_la_DEPENDENCIES = $(am__DEPENDENCIES_2)
 am_libhcl_la_OBJECTS = libhcl_la-bigint.lo libhcl_la-comp.lo \
 	libhcl_la-debug.lo libhcl_la-decode.lo libhcl_la-dic.lo \
 	libhcl_la-err.lo libhcl_la-exec.lo libhcl_la-gc.lo \
@@ -376,7 +381,8 @@ CPPFLAGS_ALL_COMMON = \
 	-I$(abs_srcdir) \
 	-I$(includedir)	
 
-LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(libdir)
+@ENABLE_STATIC_MODULE_FALSE@LDFLAGS_ALL_COMMON = -L$(abs_builddir) -L$(libdir)
+@ENABLE_STATIC_MODULE_TRUE@LDFLAGS_ALL_COMMON = -L$(abs_builddir)/../mod -L$(abs_builddir) -L$(libdir)
 
 ##################################################
 # MAIN LIBRARY 
@@ -424,12 +430,13 @@ libhcl_la_SOURCES = \
 
 libhcl_la_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 libhcl_la_LDFLAGS = $(LDFLAGS_LIB_COMMON)
-libhcl_la_LIBADD = $(LIBADD_LIB_COMMON)
+libhcl_la_LIBADD = $(LIBADD_LIB_COMMON) $(am__append_1)
+libhcl_la_DEPENDENCIES = $(am__append_2)
 hcl_SOURCES = main.c
 hcl_CPPFLAGS = $(CPPFLAGS_LIB_COMMON)
 hcl_LDFLAGS = $(LDFLAGS_LIB_COMMON)
 hcl_LDADD = $(LIBADD_LIB_COMMON) -lhcl #-ldyncall_s
-hcl_DEPENDENCIES = libhcl.la
+@ENABLE_STATIC_MODULE_TRUE@hcl_DEPENDENCIES = libhcl.la
 all: hcl-cfg.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am
 
diff --git a/lib/bigint.c b/lib/bigint.c
index afd6dec..cccaa96 100644
--- a/lib/bigint.c
+++ b/lib/bigint.c
@@ -281,7 +281,7 @@ int hcl_inttoooi (hcl_t* hcl, hcl_oop_t x, hcl_ooi_t* i)
 	hcl_oow_t w;
 	int n;
 
-	n = hcl_inttooow (hcl, x, &w);
+	n = hcl_inttooow(hcl, x, &w);
 	if (n < 0) 
 	{
 		HCL_ASSERT (hcl, HCL_TYPE_MAX(hcl_ooi_t) + HCL_TYPE_MIN(hcl_ooi_t) == -1); /* assume 2's complement */
diff --git a/lib/comp.c b/lib/comp.c
index 1b03b23..de75f8b 100644
--- a/lib/comp.c
+++ b/lib/comp.c
@@ -1378,6 +1378,8 @@ static int compile_cons_xlist_expression (hcl_t* hcl, hcl_oop_t obj)
 		}
 		else
 		{
+			hcl_oop_cons_t sdc;
+
 			if (HCL_BRANDOF(hcl, cdr) != HCL_BRAND_CONS)
 			{
 				/* (funname . 10) */
@@ -1388,10 +1390,25 @@ static int compile_cons_xlist_expression (hcl_t* hcl, hcl_oop_t obj)
 			nargs = hcl_countcons(hcl, cdr);
 			if (nargs > MAX_CODE_PARAM) 
 			{
-				/* TODO: change to syntax error */
 				hcl_setsynerrbfmt (hcl, HCL_SYNERR_ARGFLOOD, HCL_NULL, HCL_NULL, "too many(%zd) parameters in function call - %O", nargs, obj); 
 				return -1;
 			}
+
+			sdc = hcl_getatsysdic(hcl, car);
+			if (sdc)
+			{
+				hcl_oop_word_t sdv;
+				sdv = (hcl_oop_word_t)HCL_CONS_CDR(sdc);
+				if (HCL_IS_PRIM(hcl, sdv))
+				{
+					if (nargs < sdv->slot[1] || nargs > sdv->slot[2])
+					{
+						hcl_setsynerrbfmt (hcl, HCL_SYNERR_ARGCOUNT, HCL_NULL, HCL_NULL, 
+							"parameters count(%zd) mismatch in function call - %O - expecting %zu-%zu parameters", nargs, obj, sdv->slot[1], sdv->slot[2]); 
+						return -1;
+					}
+				}
+			};
 		}
 		/* redundant cdr check is performed inside compile_object_list() */
 		PUSH_SUBCFRAME (hcl, COP_COMPILE_ARGUMENT_LIST, cdr);
diff --git a/lib/exec.c b/lib/exec.c
index 90197ce..a720f7e 100644
--- a/lib/exec.c
+++ b/lib/exec.c
@@ -158,7 +158,7 @@ static HCL_INLINE int prepare_to_alloc_pid (hcl_t* hcl)
 		#if defined(HCL_DEBUG_VM_PROCESSOR)
 			HCL_LOG0 (hcl, HCL_LOG_IC | HCL_LOG_FATAL, "Processor - too many processes\n");
 		#endif
-			hcl_seterrnum (hcl, HCL_EPFULL);
+			hcl_seterrbfmt (hcl, HCL_EPFULL, "maximum number(%zd) of processes reached", HCL_SMOOI_MAX);
 			return -1;
 		}
 
@@ -227,7 +227,7 @@ static hcl_oop_process_t make_process (hcl_t* hcl, hcl_oop_context_t c)
 		stksize = HCL_TYPE_MAX(hcl_oow_t) - HCL_PROCESS_NAMED_INSTVARS;
 
 	hcl_pushtmp (hcl, (hcl_oop_t*)&c);
-	proc =  (hcl_oop_process_t)hcl_allocoopobj (hcl, HCL_BRAND_PROCESS, HCL_PROCESS_NAMED_INSTVARS + stksize);
+	proc = (hcl_oop_process_t)hcl_allocoopobj (hcl, HCL_BRAND_PROCESS, HCL_PROCESS_NAMED_INSTVARS + stksize);
 	hcl_poptmp (hcl);
 	if (!proc) return HCL_NULL;
 
@@ -348,6 +348,7 @@ static HCL_INLINE int chain_into_processor (hcl_t* hcl, hcl_oop_process_t proc,
 		HCL_LOG0 (hcl, HCL_LOG_IC | HCL_LOG_FATAL, "Processor - too many process\n");
 #endif
 		hcl_seterrnum (hcl, HCL_EPFULL);
+		hcl_seterrbfmt (hcl, HCL_EPFULL, "maximum number(%zd) of processes reached", HCL_SMOOI_MAX);
 		return -1;
 	}
 
@@ -1878,10 +1879,6 @@ static int execute (hcl_t* hcl)
 				break;
 			}
 
-/* TODO: 
-			case HCL_CODE_MAKE_BYTEARRAY:
-			case HCL_CODE_POP_INTO_BYTEARRAY:
-*/
 			/* -------------------------------------------------------- */
 
 			case BCODE_DUP_STACKTOP:
@@ -2011,16 +2008,13 @@ static int execute (hcl_t* hcl)
 			case HCL_CODE_RETURN_FROM_BLOCK:
 				LOG_INST_0 (hcl, "return_from_block");
 
-/*
-//				HCL_ASSERT(HCL_CLASSOF(hcl, hcl->active_context) == hcl->_block_context);
-*/
+				HCL_ASSERT(hcl, HCL_IS_CONTEXT(hcl, hcl->active_context));
 				if (hcl->active_context == hcl->processor->active->initial_context)
 				{
 					/* the active context to return from is an initial context of
 					 * the active process. this process must have been created 
 					 * over a block using the newProcess method. let's terminate
 					 * the process. */
-
 					HCL_ASSERT (hcl, (hcl_oop_t)hcl->active_context->sender == hcl->_nil);
 					terminate_process (hcl, hcl->processor->active);
 				}
@@ -2197,7 +2191,7 @@ oops:
 	/* TODO: anything to do here? */
 	if (hcl->processor->active != hcl->nil_process) 
 	{
-HCL_LOG1 (hcl, HCL_LOG_IC | HCL_LOG_INFO, "TERMINATING ACTIVE PROCESS ... = %zu\n", inst_counter);
+HCL_LOG1 (hcl, HCL_LOG_IC | HCL_LOG_INFO, "TERMINATING ACTIVE PROCESS ... = %zd\n", HCL_OOP_TO_SMOOI(hcl->processor->active->id));
 		terminate_process (hcl, hcl->processor->active);
 	}
 	return -1;
diff --git a/lib/hcl.c b/lib/hcl.c
index c9e5c4f..fbde730 100644
--- a/lib/hcl.c
+++ b/lib/hcl.c
@@ -402,8 +402,6 @@ void hcl_freemem (hcl_t* hcl, void* ptr)
 }
 
 
-
-
 /* -------------------------------------------------------------------------- */
 
 #define MOD_PREFIX "hcl_mod_"
@@ -411,13 +409,9 @@ void hcl_freemem (hcl_t* hcl, void* ptr)
 
 #if defined(HCL_ENABLE_STATIC_MODULE)
 
-/*#include "../mod/_array.h"*/
-
-static int hcl_mod_fake (hcl_t* hcl, hcl_mod_t* mod)
-{
-	hcl_seterrbfmt (hcl, HCL_EPERM, "not allowed to load ___fake___ module");
-	return -1;
-}
+#include "../mod/_arr.h"
+#include "../mod/_dic.h"
+#include "../mod/_str.h"
 
 static struct
 {
@@ -426,7 +420,9 @@ static struct
 }
 static_modtab[] = 
 {
-	{ "___fake___",      hcl_mod_fake },
+	{ "arr",      hcl_mod_arr },
+	{ "dic",      hcl_mod_dic },
+	{ "str",      hcl_mod_str }
 };
 #endif
 
diff --git a/lib/hcl.h b/lib/hcl.h
index 2da638c..9614f5b 100644
--- a/lib/hcl.h
+++ b/lib/hcl.h
@@ -1250,6 +1250,7 @@ typedef enum hcl_concode_t hcl_concode_t;
 #define HCL_IS_PBIGINT(hcl,v) (HCL_OOP_IS_POINTER(v) && HCL_OBJ_GET_FLAGS_BRAND(v) == HCL_BRAND_PBIGINT)
 #define HCL_IS_NBIGINT(hcl,v) (HCL_OOP_IS_POINTER(v) && HCL_OBJ_GET_FLAGS_BRAND(v) == HCL_BRAND_NBIGINT)
 #define HCL_IS_BIGINT(hcl,v) (HCL_OOP_IS_POINTER(v) && (HCL_OBJ_GET_FLAGS_BRAND(v) == HCL_BRAND_PBIGINT || HCL_OBJ_GET_FLAGS_BRAND(v) == HCL_BRAND_NBIGINT))
+#define HCL_IS_STRING(hcl,v) (HCL_OOP_IS_POINTER(v) && HCL_OBJ_GET_FLAGS_BRAND(v) == HCL_BRAND_STRING)
 
 #define HCL_CONS_CAR(v)  (((hcl_cons_t*)(v))->car)
 #define HCL_CONS_CDR(v)  (((hcl_cons_t*)(v))->cdr)
diff --git a/lib/prim.c b/lib/prim.c
index aac2343..dbda547 100644
--- a/lib/prim.c
+++ b/lib/prim.c
@@ -98,7 +98,7 @@ start_over:
 static hcl_pfrc_t pf_log (hcl_t* hcl, hcl_ooi_t nargs)
 {
 /* TODO: accept log level */
-	hcl_oop_t msg, level;
+	hcl_oop_t msg;
 	hcl_oow_t mask;
 	hcl_ooi_t k;
 
@@ -421,58 +421,3 @@ int hcl_addbuiltinprims (hcl_t* hcl)
 	return 0;
 }
 
-
-/* ------------------------------------------------------------------------- */
-
-
-static hcl_pfrc_t pf_hello (hcl_t* hcl, hcl_ooi_t nargs)
-{
-	return pf_log(hcl, nargs);
-}
-
-static int walker (hcl_t* hcl, hcl_oop_dic_t dic, hcl_oop_cons_t pair, void* ctx)
-{
-	HCL_DEBUG2 (hcl, "walker ===> %O  =====> %O\n", HCL_CONS_CAR(pair), HCL_CONS_CDR(pair));
-	return 0;
-}
-
-static hcl_pfrc_t pf_walk (hcl_t* hcl, hcl_ooi_t nargs)
-{
-	hcl_oop_t arg;
-
-	arg = HCL_STACK_GETARG(hcl, nargs, 0);
-	if (!HCL_IS_DIC(hcl,arg))
-	{
-		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not a dictionary - %O", arg);
-		return HCL_PF_FAILURE;
-	}
-
-	hcl_walkdic (hcl, (hcl_oop_dic_t)arg, walker, HCL_NULL);
-	HCL_STACK_SETRET (hcl, nargs, hcl->_true);
-	return HCL_PF_SUCCESS;
-}
-
-static hcl_pfinfo_t pfinfos[] =
-{
-	{ { 'h','e','l','l','o','\0' },         0, { pf_hello,  1,  1  } },
-	{ { 'w','a','l','k','\0' },             0, { pf_walk,   1,  1  } }
-};
-
-/* ------------------------------------------------------------------------ */
-
-static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
-{
-	return hcl_findpfbase (hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
-}
-
-static void unload (hcl_t* hcl, hcl_mod_t* mod)
-{
-}
-
-int hcl_mod_fake_test (hcl_t* hcl, hcl_mod_t* mod)
-{
-	mod->query = query;
-	mod->unload = unload; 
-	mod->ctx = HCL_NULL;
-	return 0;
-}
diff --git a/mod/Makefile.am b/mod/Makefile.am
new file mode 100644
index 0000000..28cff46
--- /dev/null
+++ b/mod/Makefile.am
@@ -0,0 +1,64 @@
+AUTOMAKE_OPTIONS = nostdinc
+
+##AM_CFLAGS = $(PTHREAD_CFLAGS)
+
+CPPFLAGS_COMMON = \
+	-I$(abs_builddir) \
+	-I$(abs_builddir)/../lib \
+	-I$(abs_srcdir) \
+	-I$(abs_srcdir)/../lib \
+	-I$(includedir)
+
+if WIN32
+# you must adjust the value of DEFAULT_PFMODPOSTFIX according 
+# to the first number in -version-info above
+CPPFLAGS_COMMON += -DHCL_DEFAULT_PFMODPREFIX=\"libhcl-\" -DHCL_DEFAULT_PFMODPOSTFIX=\"-1\"
+else
+CPPFLAGS_COMMON += -DHCL_DEFAULT_PFMODPREFIX=\"$(libdir)/libhcl-\" -DHCL_DEFAULT_PFMODPOSTFIX=\"\"
+endif
+
+if ENABLE_STATIC_MODULE
+
+##################################################
+# STATIC MODULES BUILT INTO MAIN LIBRARY
+##################################################
+LDFLAGS_COMMON =-L$(libdir) -version-info 1:0:0 -no-undefined
+LIBADD_COMMON =
+
+noinst_LTLIBRARIES =
+
+noinst_LTLIBRARIES += libhcl-arr.la
+noinst_LTLIBRARIES += libhcl-dic.la
+noinst_LTLIBRARIES += libhcl-str.la
+
+else
+
+##################################################
+# DYNAMIC MODULES 
+##################################################
+LDFLAGS_COMMON = -L$(abs_builddir)/../lib -L$(libdir) -version-info 1:0:0 -no-undefined
+LIBADD_COMMON = -lhcl
+
+pkgmodexecdir = $(libdir)
+pkgmodexec_LTLIBRARIES =
+
+pkgmodexec_LTLIBRARIES += libhcl-arr.la 
+pkgmodexec_LTLIBRARIES += libhcl-dic.la 
+pkgmodexec_LTLIBRARIES += libhcl-str.la 
+
+endif
+
+libhcl_arr_la_SOURCES = arr.c _arr.h
+libhcl_arr_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhcl_arr_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhcl_arr_la_LIBADD = $(LIBADD_COMMON) 
+
+libhcl_dic_la_SOURCES = dic.c _dic.h
+libhcl_dic_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhcl_dic_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhcl_dic_la_LIBADD = $(LIBADD_COMMON) 
+
+libhcl_str_la_SOURCES = str.c _str.h
+libhcl_str_la_CPPFLAGS = $(CPPFLAGS_COMMON)
+libhcl_str_la_LDFLAGS = $(LDFLAGS_COMMON)
+libhcl_str_la_LIBADD = $(LIBADD_COMMON) 
diff --git a/mod/Makefile.in b/mod/Makefile.in
new file mode 100644
index 0000000..716cedd
--- /dev/null
+++ b/mod/Makefile.in
@@ -0,0 +1,775 @@
+# Makefile.in generated by automake 1.15 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2014 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
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+	  $(am__strip_dir) \
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+
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+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_arr_la-arr.Tpo $(DEPDIR)/libhcl_arr_la-arr.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='arr.c' object='libhcl_arr_la-arr.lo' libtool=yes @AMDEPBACKSLASH@
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+
+libhcl_dic_la-dic.lo: dic.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_dic_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libhcl_dic_la-dic.lo -MD -MP -MF $(DEPDIR)/libhcl_dic_la-dic.Tpo -c -o libhcl_dic_la-dic.lo `test -f 'dic.c' || echo '$(srcdir)/'`dic.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_dic_la-dic.Tpo $(DEPDIR)/libhcl_dic_la-dic.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='dic.c' object='libhcl_dic_la-dic.lo' libtool=yes @AMDEPBACKSLASH@
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+
+libhcl_str_la-str.lo: str.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libhcl_str_la_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT libhcl_str_la-str.lo -MD -MP -MF $(DEPDIR)/libhcl_str_la-str.Tpo -c -o libhcl_str_la-str.lo `test -f 'str.c' || echo '$(srcdir)/'`str.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libhcl_str_la-str.Tpo $(DEPDIR)/libhcl_str_la-str.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='str.c' object='libhcl_str_la-str.lo' libtool=yes @AMDEPBACKSLASH@
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+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
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+	     $$unique
+
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+	  && $(am__cd) $(top_srcdir) \
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+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
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+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "it deletes files that may require special tools to rebuild."
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+	-rm -f Makefile
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+	distclean-tags
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+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/mod/_arr.h b/mod/_arr.h
new file mode 100644
index 0000000..e0e67c5
--- /dev/null
+++ b/mod/_arr.h
@@ -0,0 +1,43 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+#ifndef _HCL_MOD_ARR_H_
+#define _HCL_MOD_ARR_H_
+
+#include <hcl.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HCL_EXPORT int hcl_mod_arr (hcl_t* hcl, hcl_mod_t* mod);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
diff --git a/mod/_dic.h b/mod/_dic.h
new file mode 100644
index 0000000..dc0ee30
--- /dev/null
+++ b/mod/_dic.h
@@ -0,0 +1,43 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+#ifndef _HCL_MOD_DIC_H_
+#define _HCL_MOD_DIC_H_
+
+#include <hcl.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HCL_EXPORT int hcl_mod_dic (hcl_t* hcl, hcl_mod_t* mod);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
diff --git a/mod/_str.h b/mod/_str.h
new file mode 100644
index 0000000..768f2c3
--- /dev/null
+++ b/mod/_str.h
@@ -0,0 +1,43 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+#ifndef _HCL_MOD_STR_H_
+#define _HCL_MOD_STR_H_
+
+#include <hcl.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+HCL_EXPORT int hcl_mod_str (hcl_t* hcl, hcl_mod_t* mod);
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif
+
diff --git a/mod/arr.c b/mod/arr.c
new file mode 100644
index 0000000..757fb36
--- /dev/null
+++ b/mod/arr.c
@@ -0,0 +1,82 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+
+#include "_arr.h"
+
+static hcl_pfrc_t pf_arr_get (hcl_t* hcl, hcl_ooi_t nargs)
+{
+	hcl_oop_oop_t arr;
+	hcl_oop_t idx;
+	hcl_oow_t index;
+
+	arr = (hcl_oop_oop_t)HCL_STACK_GETARG(hcl, nargs, 0);
+	idx = HCL_STACK_GETARG(hcl, nargs, 1);
+
+	if (!HCL_IS_ARRAY(hcl,arr))
+	{
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not an array - %O", arr);
+		return HCL_PF_FAILURE;
+	}
+
+	if (hcl_inttooow(hcl, idx, &index) == 0) return HCL_PF_FAILURE;
+
+	if (index >= HCL_OBJ_GET_SIZE(arr))
+	{
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "array index(%zu) out of bounds(0-%zu)", index, HCL_OBJ_GET_SIZE(arr) - 1);
+		return HCL_PF_FAILURE;
+	}
+
+	HCL_STACK_SETRET (hcl, nargs, arr->slot[index]);
+	return HCL_PF_SUCCESS;
+}
+
+static hcl_pfinfo_t pfinfos[] =
+{
+	{ { 'g','e','t','\0' },      0, { pf_arr_get,     2,  2 } },
+/*	{ { 'm','a','k','e','\0' },  0, { pf_arr_make,    1,  1 } },
+	{ { 'p','u','t','\0' },      0, { pf_arr_put,     3,  3 } }*/
+};
+
+/* ------------------------------------------------------------------------ */
+
+static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
+{
+	return hcl_findpfbase(hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
+}
+
+
+static void unload (hcl_t* hcl, hcl_mod_t* mod)
+{
+}
+
+int hcl_mod_arr (hcl_t* hcl, hcl_mod_t* mod)
+{
+	mod->query = query;
+	mod->unload = unload; 
+	mod->ctx = HCL_NULL;
+	return 0;
+}
diff --git a/mod/dic.c b/mod/dic.c
new file mode 100644
index 0000000..545af7e
--- /dev/null
+++ b/mod/dic.c
@@ -0,0 +1,112 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+
+#include "_dic.h"
+
+static hcl_pfrc_t pf_dic_get (hcl_t* hcl, hcl_ooi_t nargs)
+{
+	hcl_oop_t dic;
+	hcl_oop_t key;
+	hcl_oop_cons_t pair;
+
+	dic = HCL_STACK_GETARG(hcl, nargs, 0);
+	key = HCL_STACK_GETARG(hcl, nargs, 1);
+
+	if (!HCL_IS_DIC(hcl,dic))
+	{
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not an dictionary - %O", dic);
+		return HCL_PF_FAILURE;
+	}
+
+	pair = hcl_getatdic(hcl, (hcl_oop_dic_t)dic, key);
+	if (!pair)
+	{
+		/* TODO: arrange to return ERROR instead of returnin HCL_PF_FAILURE*/
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "invalid key - %O", key);
+		return HCL_PF_FAILURE;
+
+	}
+
+	HCL_STACK_SETRET (hcl, nargs, HCL_CONS_CDR(pair));
+	return HCL_PF_SUCCESS;
+}
+
+
+
+static int walker (hcl_t* hcl, hcl_oop_dic_t dic, hcl_oop_cons_t pair, void* ctx)
+{
+	HCL_DEBUG2 (hcl, "walker ===> %O  =====> %O\n", HCL_CONS_CAR(pair), HCL_CONS_CDR(pair));
+	return 0;
+}
+
+static hcl_pfrc_t pf_dic_walk (hcl_t* hcl, hcl_ooi_t nargs)
+{
+/* TODO: write a proper function 
+ * (dic.apply #{ ... } callable-or-lambda)
+ */
+	hcl_oop_t arg;
+
+	arg = HCL_STACK_GETARG(hcl, nargs, 0);
+	if (!HCL_IS_DIC(hcl,arg))
+	{
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not a dictionary - %O", arg);
+		return HCL_PF_FAILURE;
+	}
+
+	hcl_walkdic (hcl, (hcl_oop_dic_t)arg, walker, HCL_NULL);
+	HCL_STACK_SETRET (hcl, nargs, hcl->_true);
+	return HCL_PF_SUCCESS;
+}
+
+
+static hcl_pfinfo_t pfinfos[] =
+{
+	{ { 'g','e','t','\0' },      0, { pf_dic_get,     2,  2 } },
+/*	{ { 'm','a','k','e','\0' },  0, { pf_dic_make,    1,  1 } },
+	{ { 'p','u','t','\0' },      0, { pf_dic_put,     3,  3 } },*/
+	{ { 'w','a','l','k','\0' },  0, { pf_dic_walk,    2,  2 } },
+};
+
+/* ------------------------------------------------------------------------ */
+
+static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
+{
+	return hcl_findpfbase(hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
+}
+
+
+static void unload (hcl_t* hcl, hcl_mod_t* mod)
+{
+}
+
+int hcl_mod_dic (hcl_t* hcl, hcl_mod_t* mod)
+{
+	mod->query = query;
+	mod->unload = unload; 
+	mod->ctx = HCL_NULL;
+	return 0;
+}
diff --git a/mod/str.c b/mod/str.c
new file mode 100644
index 0000000..b6b769f
--- /dev/null
+++ b/mod/str.c
@@ -0,0 +1,70 @@
+/*
+ * $Id$
+ *
+    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.
+ */
+
+
+#include "_str.h"
+
+static hcl_pfrc_t pf_str_length (hcl_t* hcl, hcl_ooi_t nargs)
+{
+	hcl_oop_t str;
+	hcl_ooi_t size;
+
+	str = HCL_STACK_GETARG(hcl, nargs, 0);
+
+	if (!HCL_IS_STRING(hcl,str))
+	{
+		hcl_seterrbfmt (hcl, HCL_EINVAL, "parameter not a string - %O", str);
+		return HCL_PF_FAILURE;
+	}
+
+	size = HCL_OBJ_GET_SIZE(str);
+	HCL_STACK_SETRET (hcl, nargs, HCL_SMOOI_TO_OOP(size));
+	return HCL_PF_SUCCESS;
+}
+
+static hcl_pfinfo_t pfinfos[] =
+{
+	{ { 'l','e','n','g','t','h','\0' },      0, { pf_str_length,     1,  1 } }
+};
+
+/* ------------------------------------------------------------------------ */
+
+static hcl_pfbase_t* query (hcl_t* hcl, hcl_mod_t* mod, const hcl_ooch_t* name, hcl_oow_t namelen)
+{
+	return hcl_findpfbase(hcl, pfinfos, HCL_COUNTOF(pfinfos), name, namelen);
+}
+
+static void unload (hcl_t* hcl, hcl_mod_t* mod)
+{
+}
+
+int hcl_mod_str (hcl_t* hcl, hcl_mod_t* mod)
+{
+	mod->query = query;
+	mod->unload = unload; 
+	mod->ctx = HCL_NULL;
+	return 0;
+}