diff --git a/qse/include/qse/xli/SkvEnv.hpp b/qse/include/qse/xli/SkvEnv.hpp
index ce898e9c..fd325467 100644
--- a/qse/include/qse/xli/SkvEnv.hpp
+++ b/qse/include/qse/xli/SkvEnv.hpp
@@ -50,16 +50,16 @@ public:
 	{
 		qse_char_t sctn[MAX_SCTN_LEN + 1];
 		qse_char_t key [MAX_KEY_LEN  + 1];
-		qse_char_t name[MAX_NAME_LEN + 1];
+		qse_char_t name[MAX_NAME_LEN + 1]; // sctn*key
 		qse_char_t dval[MAX_DVAL_LEN + 1]; // default value
 		ProbeProc probe;
 	};
 	typedef QSE::LinkedList<Item> ItemList;
 
 	SkvEnv (Mmgr* mmgr = QSE_NULL);
-	~SkvEnv ();
+	virtual ~SkvEnv ();
 
-	int addItem (const qse_char_t* name, const qse_char_t* dval, ProbeProc probe);
+	int addItem (const qse_char_t* name, const qse_char_t* dval, ProbeProc probe = QSE_NULL);
 	int removeItem (const qse_char_t* name);
 
 	const qse_char_t* getValue (const qse_char_t* name) const;
@@ -74,6 +74,18 @@ protected:
 
 	int split_name (const qse_char_t* name, qse_char_t** sctn, qse_size_t* sctn_len, qse_char_t** key, qse_size_t* key_len);
 	int set_value_with_item (Item& item, const qse_char_t* value);
+
+	virtual int probe_item_value (const Item& item, const qse_char_t* value) 
+	{
+		if (item.probe && (this->*item.probe)(value) <= -1) return -1;
+		return 0;
+	}
+
+	int call_probe_item_value (const Item& item, const qse_char_t* value) 
+	{
+		try { return this->probe_item_value(item, value); }
+		catch (...) { return -1; }
+	}
 };
 
 QSE_END_NAMESPACE(QSE)
diff --git a/qse/lib/xli/Makefile.am b/qse/lib/xli/Makefile.am
index e8050aee..b28c13ce 100644
--- a/qse/lib/xli/Makefile.am
+++ b/qse/lib/xli/Makefile.am
@@ -5,7 +5,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/include 
 
 lib_LTLIBRARIES = libqsexli.la
-libqsexli_la_SOURCES = xli.h xli.c err.c \
+libqsexli_la_SOURCES = xli-prv.h xli.c err.c \
 	read.c read-ini.c read-json.c \
 	write.c write-ini.c write-json.c \
 	std.c
diff --git a/qse/lib/xli/Makefile.in b/qse/lib/xli/Makefile.in
index 907c0656..eb44cecc 100644
--- a/qse/lib/xli/Makefile.in
+++ b/qse/lib/xli/Makefile.in
@@ -402,7 +402,7 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/include 
 
 lib_LTLIBRARIES = libqsexli.la $(am__append_1)
-libqsexli_la_SOURCES = xli.h xli.c err.c \
+libqsexli_la_SOURCES = xli-prv.h xli.c err.c \
 	read.c read-ini.c read-json.c \
 	write.c write-ini.c write-json.c \
 	std.c
diff --git a/qse/lib/xli/SkvEnv.cpp b/qse/lib/xli/SkvEnv.cpp
index 9f6bea7b..dc8a7dee 100644
--- a/qse/lib/xli/SkvEnv.cpp
+++ b/qse/lib/xli/SkvEnv.cpp
@@ -28,8 +28,10 @@
 
 #include <qse/xli/SkvEnv.hpp>
 #include <qse/xli/stdxli.h>
+
 #include <qse/cmn/str.h>
 #include "../cmn/mem-prv.h"
+#include "xli-prv.h"
 
 #define SCTN_KEY_SPLITTER QSE_T('*')
 
@@ -90,7 +92,7 @@ int SkvEnv::removeItem (const qse_char_t* name)
 
 	if (this->split_name (name, &sctn, &sctn_len, &key, &key_len) == -1) return -1;
 
-	for (ItemList::Node* np = item_list.getHeadNode(); np; np = np->getNextNode()) 
+	for (ItemList::Node* np = this->item_list.getHeadNode(); np; np = np->getNextNode()) 
 	{
 		Item& item = np->value;
 		if (qse_strxcmp(sctn, sctn_len, item.sctn) == 0 &&
@@ -113,7 +115,7 @@ const qse_char_t* SkvEnv::getValue (const qse_char_t* name) const
 
 	QSE_ASSERT (pair->val != QSE_NULL);
 	QSE_ASSERT (pair->val->type == QSE_XLI_STR);
-	
+
 	return (((qse_xli_str_t*)pair->val))->ptr;
 }
 
@@ -172,7 +174,8 @@ int SkvEnv::split_name (const qse_char_t* name, qse_char_t** sctn, qse_size_t* s
 
 int SkvEnv::set_value_with_item (Item& item, const qse_char_t* value)
 {
-	if (item.probe && (this->*item.probe)(value) <= -1) return -1;
+#if 0
+	if (this->probe_item_value(item, value) <= -1) return -1;
 
 	qse_cstr_t v = { (qse_char_t*)value, qse_strlen(value) };
 
@@ -195,7 +198,70 @@ int SkvEnv::set_value_with_item (Item& item, const qse_char_t* value)
 		if (!qse_xli_insertpairwithstr(this->xli, (qse_xli_list_t*)pair->val, QSE_NULL, item.key, QSE_NULL, QSE_NULL, &v, QSE_NULL)) return -1;
 	}
 
+	this->accept_item_value (item, value);
 	return 0;
+#else
+
+	// this function adds/updates the pair with the given value
+	// before it verifies the value. as long as verification is
+	// ok, the value is guaranteed to be set.
+
+	qse_cstr_t v = { (qse_char_t*)value, qse_strlen(value) };
+	qse_xli_pair_t* sctn_pair = QSE_NULL, * kv_pair = QSE_NULL;
+
+	sctn_pair = qse_xli_findpair(this->xli, QSE_NULL, item.sctn);
+	if (sctn_pair)
+	{
+		// section exists.
+		QSE_ASSERT (sctn_pair->val && sctn_pair->val->type == QSE_XLI_LIST);
+		kv_pair = qse_xli_findpair(this->xli, (qse_xli_list_t*)sctn_pair->val, item.key);
+		if (kv_pair)
+		{
+			// key also exists
+			qse_xli_pair_t* existing_kv_pair = kv_pair;
+
+			kv_pair = QSE_NULL;
+			sctn_pair = QSE_NULL;
+
+			qse_xli_str_t* newstrv = qse_xli_makestrval(this->xli, &v, QSE_NULL);
+			if (!newstrv) goto rollback;
+
+			if (this->call_probe_item_value(item, value) <= -1) 
+			{
+				qse_xli_freeval (this->xli, (qse_xli_val_t*)newstrv);
+				goto rollback;
+			}
+
+			qse_xli_freeval (this->xli, existing_kv_pair->val);
+			existing_kv_pair->val = (qse_xli_val_t*)newstrv;
+		}
+		else
+		{
+			kv_pair = qse_xli_insertpairwithstr(this->xli, (qse_xli_list_t*)sctn_pair->val, QSE_NULL, item.key, QSE_NULL, QSE_NULL, &v, QSE_NULL);
+			sctn_pair = QSE_NULL;
+			if (!kv_pair) goto rollback;
+
+			if (this->call_probe_item_value(item, value) <= -1)  goto rollback;
+		}
+	}
+	else
+	{
+		sctn_pair = qse_xli_insertpairwithemptylist(this->xli, QSE_NULL, QSE_NULL, item.sctn, QSE_NULL, QSE_NULL);
+		if (!sctn_pair) return -1;
+
+		kv_pair = qse_xli_insertpairwithstr(this->xli, (qse_xli_list_t*)sctn_pair->val, QSE_NULL, item.key, QSE_NULL, QSE_NULL, &v, QSE_NULL);
+		if (!kv_pair) goto rollback;
+
+		if (this->call_probe_item_value(item, value) <= -1)  goto rollback;
+	}
+
+	return 0;
+
+rollback:
+	if (kv_pair) qse_xli_deletepair (this->xli, kv_pair);
+	if (sctn_pair) qse_xli_deletepair (this->xli, sctn_pair);
+	return -1;
+#endif
 }
 
 int SkvEnv::load (const qse_char_t* path)
@@ -205,7 +271,7 @@ int SkvEnv::load (const qse_char_t* path)
 	if (!this->xli)
 	{
 		// this means that no items have been registered with
-		// this->addItem().
+		// this->addItem(). so loading is meaningless.
 		return -1;
 	}
 
@@ -239,6 +305,7 @@ int SkvEnv::load (const qse_char_t* path)
 		}
 	}
 
+// TODO: check if there are any unknown names. flag it via callbacks???
 	qse_xli_close(xli);
 	return 0;
 }
diff --git a/qse/lib/xli/err.c b/qse/lib/xli/err.c
index e36d4636..a718c65a 100644
--- a/qse/lib/xli/err.c
+++ b/qse/lib/xli/err.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include "../cmn/mem-prv.h"
 
 const qse_char_t* qse_xli_dflerrstr (const qse_xli_t* xli, qse_xli_errnum_t errnum)
diff --git a/qse/lib/xli/read-ini.c b/qse/lib/xli/read-ini.c
index deedb2a5..581502c1 100644
--- a/qse/lib/xli/read-ini.c
+++ b/qse/lib/xli/read-ini.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 /*
diff --git a/qse/lib/xli/read-json.c b/qse/lib/xli/read-json.c
index be409230..656f2755 100644
--- a/qse/lib/xli/read-json.c
+++ b/qse/lib/xli/read-json.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 /*
diff --git a/qse/lib/xli/read.c b/qse/lib/xli/read.c
index 51e83261..07e05638 100644
--- a/qse/lib/xli/read.c
+++ b/qse/lib/xli/read.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 static int get_token (qse_xli_t* xli);
diff --git a/qse/lib/xli/std.c b/qse/lib/xli/std.c
index 81f0d5d7..170bb1e9 100644
--- a/qse/lib/xli/std.c
+++ b/qse/lib/xli/std.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/xli/stdxli.h>
 #include <qse/cmn/path.h>
 #include "../cmn/mem-prv.h"
diff --git a/qse/lib/xli/write-ini.c b/qse/lib/xli/write-ini.c
index e59b3219..dc7e6b92 100644
--- a/qse/lib/xli/write-ini.c
+++ b/qse/lib/xli/write-ini.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 
 static int write_to_current_stream (qse_xli_t* xli, const qse_char_t* ptr, qse_size_t len)
 {
diff --git a/qse/lib/xli/write-json.c b/qse/lib/xli/write-json.c
index 595255e5..07dab50b 100644
--- a/qse/lib/xli/write-json.c
+++ b/qse/lib/xli/write-json.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 typedef struct arg_data_t arg_data_t;
diff --git a/qse/lib/xli/write.c b/qse/lib/xli/write.c
index e06c563f..295a8913 100644
--- a/qse/lib/xli/write.c
+++ b/qse/lib/xli/write.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 typedef struct arg_data_t arg_data_t;
diff --git a/qse/lib/xli/xli.h b/qse/lib/xli/xli-prv.h
similarity index 100%
rename from qse/lib/xli/xli.h
rename to qse/lib/xli/xli-prv.h
diff --git a/qse/lib/xli/xli.c b/qse/lib/xli/xli.c
index cf664993..b2425e0a 100644
--- a/qse/lib/xli/xli.c
+++ b/qse/lib/xli/xli.c
@@ -24,7 +24,7 @@
     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include "xli.h"
+#include "xli-prv.h"
 #include <qse/cmn/chr.h>
 
 static qse_xli_root_list_t* make_root (qse_xli_t* xli);
diff --git a/qse/samples/xli/skvenv01.cpp b/qse/samples/xli/skvenv01.cpp
index bae1042d..77ef714c 100644
--- a/qse/samples/xli/skvenv01.cpp
+++ b/qse/samples/xli/skvenv01.cpp
@@ -29,6 +29,7 @@
 #include <qse/cmn/main.h>
 #include <qse/cmn/mbwc.h>
 #include <qse/cmn/str.h>
+#include <qse/cmn/String.hpp>
 
 #include <locale.h>
 #if defined(_WIN32)
@@ -37,24 +38,32 @@
 
 class MyEnv: public QSE::SkvEnv
 {
-
+public:
+	int probe_agent_name (const qse_char_t* name)
+	{
+qse_printf (QSE_T("probing agent_name %s\n"), name);
+		return 0;
+	}
 };
 
 MyEnv myenv;
 
 static int env_main (int argc, qse_char_t* argv[])
 {
-	myenv.addItem (QSE_T("main*target"), QSE_T("file"), QSE_NULL);
-	myenv.addItem (QSE_T("main*targetq"), QSE_T("file"), QSE_NULL);
+	myenv.addItem (QSE_T("main*target"), QSE_T("file"));
+	myenv.addItem (QSE_T("main*targetq"), QSE_T("file"));
+	myenv.addItem (QSE_T("agent*name"), QSE_T("my-agent"), (MyEnv::ProbeProc)&MyEnv::probe_agent_name);
+
 	myenv.load (QSE_T("myenv.conf"));
 
-//myenv.setValue(QSE_T("main*target"), QSE_T("qqqqqq"));
-//myenv.setValue(QSE_T("main*target"), QSE_T("abcdefg"));
-//myenv.setValue(QSE_T("main*targetq"), QSE_T("zozo"));
+	QSE::String x (myenv.getValue(QSE_T("main*target")));
+	x.append (QSE_T("-jj"));
+	myenv.setValue(QSE_T("main*target"), x);
+
 	const qse_char_t* v = myenv.getValue(QSE_T("main*target"));
 	qse_printf (QSE_T("%s\n"), (v? v: QSE_T("<null>")));
 
-myenv.store (QSE_T("myenv.conf"));
+	myenv.store (QSE_T("myenv.conf"));
 	return 0;
 }