diff -r ec750c536705 -r e11f1ad20826 include/relpipe/reader/handlers/RelationalReaderStringHandler.h
--- a/include/relpipe/reader/handlers/RelationalReaderStringHandler.h	Mon Aug 27 00:06:14 2018 +0200
+++ b/include/relpipe/reader/handlers/RelationalReaderStringHandler.h	Mon Sep 03 23:40:12 2018 +0200
@@ -13,6 +13,11 @@
 public:
 	
 	virtual void attribute(const string_t& value) = 0;
+	
+	// TODO: null values:
+	// a) special constant for null value
+	// b) virtual void attribute(const string_t& value, boolean_t isNull) = 0;
+	// c) virtual void null() = 0;
 
 };