diff -r ea747b9d46d0 -r 6e3494943c91 common.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/common.h	Sun Jul 08 01:40:38 2018 +0200
@@ -0,0 +1,36 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+namespace relpipe {
+namespace writer {
+
+using octet_t = uint8_t;
+using integer_t = uint64_t;
+using boolean_t = bool;
+using string_t = std::wstring;
+
+const integer_t DATA_TYPE_ID_BOOLEAN = 1;
+const integer_t DATA_TYPE_ID_INTEGER = 2;
+const integer_t DATA_TYPE_ID_STRING = 3;
+
+const string_t DATA_TYPE_CODE_BOOLEAN = L"boolean";
+const string_t DATA_TYPE_CODE_INTEGER = L"integer";
+const string_t DATA_TYPE_CODE_STRING = L"string";
+
+
+/**
+ * With respect for the tradition and computer pioneers, we use same numbers as in ASCII texts:
+ * 
+ * 1C    FS  ␜  File Separator
+ * 1D    GS  ␝  Group Separator
+ * 1E    RS  ␞  Record Separator
+ * 1F    US  ␟  Unit Separator
+ * 
+ */
+const integer_t DATA_PART_START = 0x1D;
+const integer_t DATA_PART_ROW = 0x1E;
+
+}
+}
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