diff --git a/qse/cmd/sed/sed.c b/qse/cmd/sed/sed.c
index 3b23d838..63e236be 100644
--- a/qse/cmd/sed/sed.c
+++ b/qse/cmd/sed/sed.c
@@ -463,11 +463,17 @@ static void trace_exec (qse_sed_t* sed, qse_sed_exec_op_t op, const qse_sed_cmd_
 			break;
 #endif
 		case QSE_SED_EXEC_MATCH:
-			qse_printf (QSE_T("matching address for [%c] at line %lu\n"), cmd->type, (unsigned long)cmd->loc.line);
+			qse_printf (QSE_T("matching address for [%c] in %s at line %lu\n"), 
+				cmd->type, 
+				(cmd->lid? cmd->lid: QSE_T("<<UNKNOWN>>")), 
+				(unsigned long)cmd->loc.line);
 			break;
 
 		case QSE_SED_EXEC_EXEC:
-			qse_printf (QSE_T("executing [%c] at line %lu\n"), cmd->type, (unsigned long)cmd->loc.line);
+			qse_printf (QSE_T("executing [%c] in %s at line %lu\n"), 
+				cmd->type, 
+				(cmd->lid? cmd->lid: QSE_T("<<UNKNOWN>>")), 
+				(unsigned long)cmd->loc.line);
 			break;
 	}
 }
diff --git a/qse/include/qse/sed/Sed.hpp b/qse/include/qse/sed/Sed.hpp
index 22f0c965..d6d49f07 100644
--- a/qse/include/qse/sed/Sed.hpp
+++ b/qse/include/qse/sed/Sed.hpp
@@ -267,6 +267,12 @@ public:
 		const loc_t*  loc = QSE_NULL   ///< error location
 	);
 
+	const char_t* getCompileId () const;
+
+	const char_t* setCompileId (
+		const char_t* id
+	);
+
 	///
 	/// The getConsoleLine() function returns the current line
 	/// number from an input console. 
diff --git a/qse/include/qse/sed/sed.h b/qse/include/qse/sed/sed.h
index 9853bb8c..45cdc8d8 100644
--- a/qse/include/qse/sed/sed.h
+++ b/qse/include/qse/sed/sed.h
@@ -130,7 +130,9 @@ struct qse_sed_adr_t
 struct qse_sed_cmd_t
 {
 	qse_char_t type;
-	qse_sed_loc_t loc;
+
+	const qse_char_t* lid;
+	qse_sed_loc_t     loc;
 
 	int negated;
 
@@ -521,18 +523,40 @@ void qse_sed_setlformatter (
 	qse_sed_lformatter_t lformatter /**< text formatter */
 );
 
+/**
+ * The qse_sed_getcompid() function returns the latest
+ * identifier successfully set with qse_sed_setcompid(). 
+ */
+const qse_char_t* qse_sed_getcompid (
+	qse_sed_t* sed
+);
+
+/**
+ * The qse_sed_setcompid() functions duplicates a string
+ * pointed to by @a id and stores it internally to identify
+ * the script currently being compiled. The lid field of the 
+ * current command being compiled in the script is set to the 
+ * lastest identifer successfully set with this function.
+ * If this function fails, the location set in the command
+ * may be wrong.
+ */
+const qse_char_t* qse_sed_setcompid (
+	qse_sed_t*        sed,
+	const qse_char_t* id
+);
+
 /**
  * The qse_sed_getlinnum() function gets the current input line number.
  * @return current input line number
  */
-qse_size_t qse_sed_getlinnum (
+qse_size_t qse_sed_getlinenum (
 	qse_sed_t* sed /**< stream editor */
 );
 
 /**
- * The qse_sed_setlinnum() function changes the current input line number.
+ * The qse_sed_setlinenum() function changes the current input line number.
  */
-void qse_sed_setlinnum (
+void qse_sed_setlinenum (
 	qse_sed_t* sed,   /**< stream editor */
 	qse_size_t num    /**< a line number */
 );
diff --git a/qse/lib/sed/Sed.cpp b/qse/lib/sed/Sed.cpp
index 7c925650..0535787f 100644
--- a/qse/lib/sed/Sed.cpp
+++ b/qse/lib/sed/Sed.cpp
@@ -112,7 +112,8 @@ Sed::loc_t Sed::getErrorLocation () const
 	if (sed == QSE_NULL) 
 	{
 		loc_t loc;
-		loc.line = 0; loc.colm = 0;
+		loc.line = 0; 
+		loc.colm = 0;
 		return loc;
 	}
 	return *qse_sed_geterrloc (sed);
@@ -129,16 +130,26 @@ void Sed::setError (errnum_t err, const cstr_t* args, const loc_t* loc)
 	qse_sed_seterror (sed, err, args, loc);
 }
 
+const Sed::char_t* Sed::getCompileId () const
+{
+	return qse_sed_getcompid (this->sed);
+}
+
+const Sed::char_t* Sed::setCompileId (const char_t* id)
+{
+	return qse_sed_setcompid (this->sed, id);
+}
+
 Sed::size_t Sed::getConsoleLine ()
 {
 	QSE_ASSERT (sed != QSE_NULL);
-	return qse_sed_getlinnum (sed);
+	return qse_sed_getlinenum (this->sed);
 }
 
 void Sed::setConsoleLine (size_t num)
 {
 	QSE_ASSERT (sed != QSE_NULL);
-	qse_sed_setlinnum (sed, num);
+	qse_sed_setlinenum (this->sed, num);
 }
 
 Sed::ssize_t Sed::sin (
diff --git a/qse/lib/sed/sed.c b/qse/lib/sed/sed.c
index c70edca6..8e7609f9 100644
--- a/qse/lib/sed/sed.c
+++ b/qse/lib/sed/sed.c
@@ -38,6 +38,7 @@ QSE_IMPLEMENT_COMMON_FUNCTIONS (sed)
 
 static void free_command (qse_sed_t* sed, qse_sed_cmd_t* cmd);
 static void free_all_command_blocks (qse_sed_t* sed);
+static void free_all_cids (qse_sed_t* sed);
 static void free_appends (qse_sed_t* sed);
 static int emit_output (qse_sed_t* sed, int skipline);
 
@@ -130,6 +131,7 @@ oops_1:
 void qse_sed_fini (qse_sed_t* sed)
 {
 	free_all_command_blocks (sed);
+	free_all_cids (sed);
 
 	qse_str_fini (&sed->e.txt.subst);
 	qse_str_fini (&sed->e.txt.hold);
@@ -582,6 +584,15 @@ static void free_command (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 	}
 }
 
+static void free_all_cids (qse_sed_t* sed)
+{
+	while (sed->src.cid)
+	{
+		qse_sed_cid_t* next = sed->src.cid->next;
+		QSE_MMGR_FREE (sed->mmgr, sed->src.cid);
+		sed->src.cid = next;
+	}
+}
 
 static QSE_INLINE int xdigit_to_num (qse_cint_t c)
 {
@@ -1501,6 +1512,7 @@ static int get_command (qse_sed_t* sed, qse_sed_cmd_t* cmd)
 	qse_cint_t c;
 
 	c = CURSC (sed);
+	cmd->lid = sed->src.cid? ((const qse_char_t*)(sed->src.cid + 1)): QSE_NULL;
 	cmd->loc = sed->src.loc;
 	switch (c)
 	{
@@ -1739,20 +1751,13 @@ int qse_sed_comp (qse_sed_t* sed, qse_sed_io_fun_t inf)
 		return -1;	
 	}
 
-	/* store the source code pointers */
-	sed->src.fun = inf;
-	if (open_script_stream (sed) <= -1) return -1;
-
-	sed->src.loc.line = 1;
-	sed->src.loc.colm = 0;
-	sed->src.cc = QSE_CHAR_EOF;
-	
-	NXTSC_GOTO (sed, c, oops);
-
 	/* free all the commands previously compiled */
 	free_all_command_blocks (sed);
 	QSE_ASSERT (sed->cmd.lb == &sed->cmd.fb && sed->cmd.lb->len == 0);
 
+	/* free all the compilation identifiers */
+	free_all_cids (sed);
+
 	/* clear the label table */
 	qse_map_clear (&sed->tmp.labs);
 
@@ -1760,6 +1765,11 @@ int qse_sed_comp (qse_sed_t* sed, qse_sed_io_fun_t inf)
 	sed->tmp.grp.level = 0;
 	qse_str_clear (&sed->tmp.rex);
 
+	/* open script */
+	sed->src.fun = inf;
+	if (open_script_stream (sed) <= -1) return -1;
+	NXTSC_GOTO (sed, c, oops);
+
 	while (1)
 	{
 		int n;
@@ -3615,12 +3625,33 @@ void qse_sed_setlformatter (qse_sed_t* sed, qse_sed_lformatter_t lf)
 	sed->lformatter = lf;
 }
 
-qse_size_t qse_sed_getlinnum (qse_sed_t* sed)
+const qse_char_t* qse_sed_getcompid (qse_sed_t* sed)
+{
+	return sed->src.cid? ((const qse_char_t*)(sed->src.cid + 1)): QSE_NULL;
+}
+
+const qse_char_t* qse_sed_setcompid (qse_sed_t* sed, const qse_char_t* id)
+{
+	qse_sed_cid_t* cid;
+	qse_size_t len;
+	
+	len = qse_strlen (id);
+	cid = QSE_MMGR_ALLOC (sed->mmgr, QSE_SIZEOF(*cid) + ((len + 1) * QSE_SIZEOF(*id)));
+	if (cid == QSE_NULL) return QSE_NULL;
+	
+	cid->next = sed->src.cid;
+	sed->src.cid = cid;
+	qse_strcpy ((qse_char_t*)(cid + 1), id);
+
+	return (const qse_char_t*)(cid + 1);
+}
+
+qse_size_t qse_sed_getlinenum (qse_sed_t* sed)
 {
 	return sed->e.in.num;
 }
 
-void qse_sed_setlinnum (qse_sed_t* sed, qse_size_t num)
+void qse_sed_setlinenum (qse_sed_t* sed, qse_size_t num)
 {
 	sed->e.in.num = num;
 }
@@ -3634,3 +3665,4 @@ void qse_sed_setexectracer (qse_sed_t* sed, qse_sed_exec_tracer_t tracer)
 {
 	sed->e.tracer = tracer;
 }
+
diff --git a/qse/lib/sed/sed.h b/qse/lib/sed/sed.h
index 0f6e4051..8227b0fa 100644
--- a/qse/lib/sed/sed.h
+++ b/qse/lib/sed/sed.h
@@ -55,6 +55,12 @@ struct qse_sed_cmd_blk_t
 	qse_sed_cmd_blk_t* next;
 };
 
+typedef struct qse_sed_cid_t qse_sed_cid_t;
+struct qse_sed_cid_t
+{
+	qse_sed_cid_t* next;		
+};
+
 /** 
  * The qse_sed_t type defines a stream editor 
  */
@@ -88,6 +94,7 @@ struct qse_sed_t
 		qse_char_t        buf[1024];
 		int               eof;
 
+		qse_sed_cid_t*    cid;
 		qse_sed_loc_t     loc; /**< location */
 		qse_cint_t        cc;  /**< last character read */
 		const qse_char_t* ptr; /**< beginning of the source text */
diff --git a/qse/lib/sed/std.c b/qse/lib/sed/std.c
index 8f8b5b0d..f168bfec 100644
--- a/qse/lib/sed/std.c
+++ b/qse/lib/sed/std.c
@@ -45,6 +45,8 @@ struct xtn_t
 	struct
 	{
 		xtn_in_t in;
+		qse_char_t last;
+		int newline_squeezed;
 	} s;
 	struct
 	{
@@ -54,6 +56,44 @@ struct xtn_t
 };
 
 
+static int int_to_str (qse_size_t val, qse_char_t* buf, qse_size_t buflen)
+{
+	qse_size_t t;
+	qse_size_t rlen = 0;
+
+	t = val;
+	if (t == 0) rlen++;
+	else
+	{
+		/* non-zero values */
+		if (t < 0) { t = -t; rlen++; }
+		while (t > 0) { rlen++; t /= 10; }
+	}
+
+	if (rlen >= buflen) return -1; /* buffer too small */
+
+	buf[rlen] = QSE_T('\0');
+
+	t = val;
+	if (t == 0) buf[0] = QSE_T('0'); 
+	else
+	{
+		if (t < 0) t = -t;
+
+		/* fill in the buffer with digits */
+		while (t > 0) 
+		{
+			buf[--rlen] = (qse_char_t)(t % 10) + QSE_T('0');
+			t /= 10;
+		}
+
+		/* insert the negative sign if necessary */
+		if (val < 0) buf[--rlen] = QSE_T('-');
+	}
+
+	return 0;
+}
+
 qse_sed_t* qse_sed_openstd (qse_size_t xtnsize)
 {
 	return qse_sed_openstdwithmmgr (QSE_MMGR_GETDFL(), xtnsize);
@@ -151,7 +191,7 @@ static void close_main_stream (
 static int open_input_stream (
 	qse_sed_t* sed, qse_sed_io_arg_t* arg, qse_sed_iostd_t* io, xtn_in_t* base)
 {
-	/*xtn_t* xtn = (xtn_t*) QSE_XTN (sed);*/
+	xtn_t* xtn = (xtn_t*) QSE_XTN (sed);
 
 	QSE_ASSERT (io != QSE_NULL);
 	switch (io->type)
@@ -185,6 +225,25 @@ static int open_input_stream (
 			return -1;
 	}
 
+
+	if (base == &xtn->s.in)
+	{
+		/* reset script location */
+		if (io->type == QSE_SED_IOSTD_FILE) 
+		{
+			qse_sed_setcompid (sed, io->u.file);
+		}
+		else 
+		{
+			qse_char_t buf[64];
+			buf[0] = (io->type == QSE_SED_IOSTD_MEM)? QSE_T('M'): QSE_T('S');
+			buf[1] = QSE_T('#');
+			if (int_to_str (io - xtn->s.in.ptr, &buf[2], QSE_COUNTOF(buf) - 2) >= 0)
+				qse_sed_setcompid (sed, buf);
+		}
+		sed->src.loc.line = 1; 
+		sed->src.loc.colm = 1;
+	}
 	return 0;
 }
 
@@ -257,7 +316,6 @@ static qse_ssize_t read_input_stream (
 	qse_sed_iostd_t* io, * next;
 	void* old, * new;
 	qse_ssize_t n = 0;
-	int newline_forced = 0;
 
 	if (len > QSE_TYPE_MAX(qse_ssize_t)) len = QSE_TYPE_MAX(qse_ssize_t);
 
@@ -265,7 +323,14 @@ static qse_ssize_t read_input_stream (
 	{
 		io = base->cur;
 
+		if (base == &xtn->s.in && xtn->s.newline_squeezed) 
+		{
+			xtn->s.newline_squeezed = 0;
+			goto open_next;
+		}
+
 		QSE_ASSERT (io != QSE_NULL);
+
 		if (io->type == QSE_SED_IOSTD_MEM)
 		{
 			n = 0;
@@ -285,15 +350,9 @@ static qse_ssize_t read_input_stream (
 					qse_sed_seterrnum (sed, QSE_SED_EIOFIL, &ea);
 				}
 			}
-			else if (newline_forced)
+			else if (base == &xtn->s.in)
 			{
-				/* set the line number to 0 for the newline
-				 * squeezed in. see the getnextsc() in sed.c 
-				 * to know how line and column numbers are
-				 * incremented */
-				sed->src.loc.line = 0; 
-				sed->src.loc.colm = 0;
-				n += newline_forced; 
+				xtn->s.last = buf[n-1];
 			}
 
 			break;
@@ -303,6 +362,16 @@ static qse_ssize_t read_input_stream (
 		/* == end of file on the current input stream == */
 		/* ============================================= */
 
+		if (base == &xtn->s.in && xtn->s.last != QSE_T('\n'))
+		{
+			/* TODO: different line termination convension */
+			buf[0] = QSE_T('\n'); 
+			n = 1;
+			xtn->s.newline_squeezed = 1;
+			break;
+		}
+
+	open_next:
 		next = base->cur + 1;
 		if (next->type == QSE_SED_IOSTD_NULL) 
 		{
@@ -327,25 +396,18 @@ static qse_ssize_t read_input_stream (
 			n = -1;
 			break;
 		}
+
+		/* successfuly opened the next input stream */
 		new = arg->handle;
 
 		arg->handle = old;
+
+		/* close the previous stream */
 		close_main_stream (sed, arg, io);
 
 		arg->handle = new;
+
 		base->cur++;
-
-		if (base == &xtn->s.in && !newline_forced)
-		{
-			/* == ONLY FOR A SCRIPT STREAM ==
-			 * squeeze in a new line in case the previous script 
-			 * stream doesn't end with a line terminator.*/  
-
-			/* TODO: support different line terminator */ 
-			buf[0] = QSE_T('\n'); 
-			buf++; len--;	
-			newline_forced = 1;
-		}
 	}
 	while (1);