--- a/include/DataTypeReader.h	Sat Jul 14 17:06:04 2018 +0200
+++ b/include/DataTypeReader.h	Sat Jul 14 17:10:01 2018 +0200
@@ -18,11 +18,6 @@
 
 	virtual string_t readString(std::istream &input);
 
-	virtual void writeValue(std::ostream& output, const T& value) = 0;
-
-	virtual void writeString(std::ostream& output, const string_t &stringValue);
-
-	virtual T toValue(const string_t &stringValue) = 0;
 	virtual string_t toString(const T& value) = 0;
 
 };

--- a/include/DataTypeReaderBase.h	Sat Jul 14 17:06:04 2018 +0200
+++ b/include/DataTypeReaderBase.h	Sat Jul 14 17:10:01 2018 +0200
@@ -32,15 +32,6 @@
 	virtual string_t readString(std::istream &input) = 0;
 
 	/**
-	 * @param output output stream, should be at position where the value is to be written; the stream will not be closed not flushed after writing
-	 * @param stringValue write value as given data type (e.g. integer or boolean); stringValue parameter contains given value in string representation of given data type
-	 * E.g. integer 123 is passed as a character string "123"
-	 * boolean true is passed as a character string "true".
-	 * See Relational pipes format specification for details.
-	 */
-	virtual void writeString(std::ostream& output, const string_t &stringValue) = 0;
-
-	/**
 	 * @param dataType data type code as defined in DDP L0
 	 * @return whether this class supports conversions of this type
 	 */

--- a/src/DataTypeReader.cpp	Sat Jul 14 17:06:04 2018 +0200
+++ b/src/DataTypeReader.cpp	Sat Jul 14 17:10:01 2018 +0200
@@ -7,9 +7,5 @@
 	return toString(readValue(input));
 };
 
-template<typename T> void DataTypeReader<T>::writeString(std::ostream& output, const string_t &stringValue) {
-	writeValue(output, toValue(stringValue));
-};
-
 }
 }