diff --git a/src/Makefile.dep b/src/Makefile.dep
index 53fbb00..a3e1eb4 100644
--- a/src/Makefile.dep
+++ b/src/Makefile.dep
@@ -10,28 +10,31 @@
 ./convert/double.o: convert/inttostr.h utf8/utf8.h textstream/stream.h
 ./convert/double.o: utf8/utf8_templates.h utf8/utf8_private.h date/date.h
 ./convert/double.o: membuffer/membuffer.h textstream/types.h
+./convert/double.o: textstream/stream_private.h
 ./convert/baseparser.o: ./convert/baseparser.h textstream/textstream.h
 ./convert/baseparser.o: textstream/stream.h space/space.h textstream/types.h
 ./convert/baseparser.o: convert/inttostr.h utf8/utf8.h textstream/stream.h
 ./convert/baseparser.o: utf8/utf8_templates.h utf8/utf8_private.h date/date.h
 ./convert/baseparser.o: membuffer/membuffer.h textstream/types.h
+./convert/baseparser.o: textstream/stream_private.h
 ./date/date.o: ./date/date.h convert/inttostr.h
 ./log/filelog.o: ./log/filelog.h textstream/textstream.h textstream/stream.h
 ./log/filelog.o: space/space.h textstream/types.h convert/inttostr.h
 ./log/filelog.o: utf8/utf8.h textstream/stream.h utf8/utf8_templates.h
 ./log/filelog.o: utf8/utf8_private.h date/date.h membuffer/membuffer.h
-./log/filelog.o: textstream/types.h
+./log/filelog.o: textstream/types.h textstream/stream_private.h
 ./log/log.o: ./log/log.h textstream/textstream.h textstream/stream.h
 ./log/log.o: space/space.h textstream/types.h convert/inttostr.h utf8/utf8.h
 ./log/log.o: textstream/stream.h utf8/utf8_templates.h utf8/utf8_private.h
 ./log/log.o: date/date.h membuffer/membuffer.h textstream/types.h
-./log/log.o: ./log/filelog.h
+./log/log.o: textstream/stream_private.h ./log/filelog.h
 ./space/space.o: ./space/space.h textstream/types.h convert/inttostr.h
 ./space/space.o: utf8/utf8.h textstream/stream.h utf8/utf8_templates.h
 ./space/space.o: utf8/utf8_private.h convert/convert.h ./convert/inttostr.h
 ./space/space.o: convert/patternreplacer.h textstream/textstream.h
 ./space/space.o: textstream/stream.h space/space.h date/date.h
-./space/space.o: membuffer/membuffer.h textstream/types.h convert/strtoint.h
+./space/space.o: membuffer/membuffer.h textstream/types.h
+./space/space.o: textstream/stream_private.h convert/strtoint.h
 ./space/space.o: ./convert/text.h ./convert/misc.h ./convert/double.h
 ./space/spaceparser.o: ./space/spaceparser.h ./space/space.h
 ./space/spaceparser.o: textstream/types.h convert/inttostr.h utf8/utf8.h
@@ -39,8 +42,18 @@
 ./space/spaceparser.o: utf8/utf8_private.h convert/baseparser.h
 ./space/spaceparser.o: textstream/textstream.h textstream/stream.h
 ./space/spaceparser.o: space/space.h date/date.h membuffer/membuffer.h
-./space/spaceparser.o: textstream/types.h convert/strtoint.h ./convert/text.h
-./space/spaceparser.o: ./convert/misc.h
+./space/spaceparser.o: textstream/types.h textstream/stream_private.h
+./space/spaceparser.o: convert/strtoint.h ./convert/text.h ./convert/misc.h
+./space/keyvalueparser.o: ./space/keyvalueparser.h ./space/space.h
+./space/keyvalueparser.o: textstream/types.h convert/inttostr.h utf8/utf8.h
+./space/keyvalueparser.o: textstream/stream.h utf8/utf8_templates.h
+./space/keyvalueparser.o: utf8/utf8_private.h convert/baseparser.h
+./space/keyvalueparser.o: textstream/textstream.h textstream/stream.h
+./space/keyvalueparser.o: space/space.h date/date.h membuffer/membuffer.h
+./space/keyvalueparser.o: textstream/types.h textstream/stream_private.h
+./space/keyvalueparser.o: convert/strtoint.h ./convert/text.h
+./space/keyvalueparser.o: ./convert/misc.h
+./textstream/stream_private.o: textstream/stream_private.h
 ./utf8/utf8.o: ./utf8/utf8.h textstream/stream.h utf8/utf8_templates.h
 ./utf8/utf8.o: utf8/utf8_private.h
 ./utf8/utf8_private.o: utf8/utf8_private.h
@@ -49,7 +62,7 @@
 ./csv/csvparser.o: utf8/utf8_templates.h utf8/utf8_private.h
 ./csv/csvparser.o: convert/baseparser.h textstream/textstream.h
 ./csv/csvparser.o: textstream/stream.h date/date.h membuffer/membuffer.h
-./csv/csvparser.o: textstream/types.h
+./csv/csvparser.o: textstream/types.h textstream/stream_private.h
 ./mainoptions/mainoptionsparser.o: ./mainoptions/mainoptionsparser.h
 ./mainoptions/mainoptionsparser.o: space/space.h textstream/types.h
 ./mainoptions/mainoptionsparser.o: convert/inttostr.h utf8/utf8.h
@@ -61,9 +74,11 @@
 ./html/bbcodeparser.o: convert/inttostr.h utf8/utf8.h textstream/stream.h
 ./html/bbcodeparser.o: utf8/utf8_templates.h utf8/utf8_private.h date/date.h
 ./html/bbcodeparser.o: membuffer/membuffer.h textstream/types.h
+./html/bbcodeparser.o: textstream/stream_private.h
 ./html/htmlparser.o: ./html/htmlparser.h convert/baseparser.h
 ./html/htmlparser.o: textstream/textstream.h textstream/stream.h
 ./html/htmlparser.o: space/space.h textstream/types.h convert/inttostr.h
 ./html/htmlparser.o: utf8/utf8.h textstream/stream.h utf8/utf8_templates.h
 ./html/htmlparser.o: utf8/utf8_private.h date/date.h membuffer/membuffer.h
-./html/htmlparser.o: textstream/types.h convert/text.h
+./html/htmlparser.o: textstream/types.h textstream/stream_private.h
+./html/htmlparser.o: convert/text.h
diff --git a/src/textstream/stream_private.cpp b/src/textstream/stream_private.cpp
new file mode 100644
index 0000000..1e2ad77
--- /dev/null
+++ b/src/textstream/stream_private.cpp
@@ -0,0 +1,55 @@
+/*
+ * This file is a part of PikoTools
+ * and is distributed under the 2-Clause BSD licence.
+ * Author: Tomasz Sowa <t.sowa@ttmath.org>
+ */
+
+/*
+ * Copyright (c) 2024, Tomasz Sowa
+ * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 "stream_private.h"
+
+#ifdef PT_HAS_MORM_LIBRARY
+#include "morm.h"
+#endif
+
+namespace pt::private_namespace
+{
+
+#ifdef PT_HAS_MORM_LIBRARY
+void serialize_to_stream(morm::Model & model, pt::Stream & str)
+{
+	str << model.to_string();
+}
+#endif
+
+
+}
+
+
+
diff --git a/src/textstream/stream_private.h b/src/textstream/stream_private.h
new file mode 100644
index 0000000..c56ed5a
--- /dev/null
+++ b/src/textstream/stream_private.h
@@ -0,0 +1,62 @@
+/*
+ * This file is a part of PikoTools
+ * and is distributed under the 2-Clause BSD licence.
+ * Author: Tomasz Sowa <t.sowa@ttmath.org>
+ */
+
+/*
+ * Copyright (c) 2024, Tomasz Sowa
+ * 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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 headerfile_pikotools_src_textstream_stream_private
+#define headerfile_pikotools_src_textstream_stream_private
+
+
+#ifdef PT_HAS_MORM_LIBRARY
+namespace morm
+{
+	class Model;
+}
+#endif
+
+
+namespace pt
+{
+class Stream;
+
+
+namespace private_namespace
+{
+
+#ifdef PT_HAS_MORM_LIBRARY
+	void serialize_to_stream(morm::Model & model, pt::Stream & str);
+#endif
+
+}
+}
+
+#endif
diff --git a/src/textstream/textstream.h b/src/textstream/textstream.h
index 7b48818..f703e4a 100644
--- a/src/textstream/textstream.h
+++ b/src/textstream/textstream.h
@@ -43,11 +43,13 @@
 #include "membuffer/membuffer.h"
 #include "types.h"
 #include "utf8/utf8.h"
+#include "stream_private.h"
 
 // for snprintf
 #include <cstdio>
 
 
+
 namespace pt
 {
 
@@ -194,6 +196,10 @@ public:
 	TextStreamBase & operator<<(const Space & space);
 	TextStreamBase & operator<<(const Date & date);
 
+#ifdef PT_HAS_MORM_LIBRARY
+	TextStreamBase & operator<<(morm::Model & model);
+#endif
+
 	template<typename arg_char_type, size_t arg_stack_size, size_t arg_heap_block_size>
 	TextStreamBase & operator<<(const TextStreamBase<arg_char_type, arg_stack_size, arg_heap_block_size> & arg);
 
@@ -1200,6 +1206,23 @@ return *this;
 }
 
 
+
+#ifdef PT_HAS_MORM_LIBRARY
+
+template<typename char_type, size_t stack_size, size_t heap_block_size>
+TextStreamBase<char_type, stack_size, heap_block_size> &
+TextStreamBase<char_type, stack_size, heap_block_size>::operator<<(morm::Model & model)
+{
+	private_namespace::serialize_to_stream(model, *this);
+
+return *this;
+}
+
+#endif
+
+
+
+
 template<typename char_type, size_t stack_size, size_t heap_block_size>
 template<typename arg_char_type, size_t arg_stack_size, size_t arg_heap_block_size>
 TextStreamBase<char_type, stack_size, heap_block_size> &
diff --git a/tests/Makefile.dep b/tests/Makefile.dep
index 5fd8554..0356e4f 100644
--- a/tests/Makefile.dep
+++ b/tests/Makefile.dep
@@ -7,16 +7,17 @@
 ./convert.o: ../src/utf8/utf8.h ../src/textstream/stream.h
 ./convert.o: ../src/utf8/utf8_templates.h ../src/utf8/utf8_private.h
 ./convert.o: ../src/date/date.h ../src/membuffer/membuffer.h
-./convert.o: ../src/textstream/types.h ../src/convert/strtoint.h
-./convert.o: ../src/convert/text.h ../src/convert/misc.h
-./convert.o: ../src/convert/double.h test.h
+./convert.o: ../src/textstream/types.h ../src/textstream/stream_private.h
+./convert.o: ../src/convert/strtoint.h ../src/convert/text.h
+./convert.o: ../src/convert/misc.h ../src/convert/double.h test.h
 ./csvparser.o: csvparser.h ../src/csv/csvparser.h ../src/space/space.h
 ./csvparser.o: ../src/textstream/types.h ../src/convert/inttostr.h
 ./csvparser.o: ../src/utf8/utf8.h ../src/textstream/stream.h
 ./csvparser.o: ../src/utf8/utf8_templates.h ../src/utf8/utf8_private.h
 ./csvparser.o: ../src/convert/baseparser.h ../src/textstream/textstream.h
 ./csvparser.o: ../src/textstream/stream.h ../src/date/date.h
-./csvparser.o: ../src/membuffer/membuffer.h ../src/textstream/types.h test.h
+./csvparser.o: ../src/membuffer/membuffer.h ../src/textstream/types.h
+./csvparser.o: ../src/textstream/stream_private.h test.h
 ./main.o: convert.h ../src/convert/convert.h ../src/convert/inttostr.h
 ./main.o: ../src/convert/patternreplacer.h ../src/textstream/textstream.h
 ./main.o: ../src/textstream/stream.h ../src/space/space.h
@@ -24,9 +25,10 @@
 ./main.o: ../src/utf8/utf8.h ../src/textstream/stream.h
 ./main.o: ../src/utf8/utf8_templates.h ../src/utf8/utf8_private.h
 ./main.o: ../src/date/date.h ../src/membuffer/membuffer.h
-./main.o: ../src/textstream/types.h ../src/convert/strtoint.h
-./main.o: ../src/convert/text.h ../src/convert/misc.h ../src/convert/double.h
-./main.o: test.h mainoptionsparser.h csvparser.h
+./main.o: ../src/textstream/types.h ../src/textstream/stream_private.h
+./main.o: ../src/convert/strtoint.h ../src/convert/text.h
+./main.o: ../src/convert/misc.h ../src/convert/double.h test.h
+./main.o: mainoptionsparser.h csvparser.h
 ./test.o: test.h
 ./mainoptionsparser.o: mainoptionsparser.h test.h
 ./mainoptionsparser.o: ../src/mainoptions/mainoptionsparser.h
@@ -40,5 +42,6 @@
 ./mainoptionsparser.o: ../src/textstream/textstream.h
 ./mainoptionsparser.o: ../src/textstream/stream.h ../src/date/date.h
 ./mainoptionsparser.o: ../src/membuffer/membuffer.h ../src/textstream/types.h
+./mainoptionsparser.o: ../src/textstream/stream_private.h
 ./mainoptionsparser.o: ../src/convert/strtoint.h ../src/convert/text.h
 ./mainoptionsparser.o: ../src/convert/misc.h ../src/convert/double.h