--- a/src/ASN1Writer.h	Sat Mar 30 01:39:05 2019 +0100
+++ b/src/ASN1Writer.h	Sat Mar 30 01:51:54 2019 +0100
@@ -63,6 +63,7 @@
 	};
 
 	enum UniversalType : uint16_t {
+		EndOfContent = 0,
 		Boolean = 1,
 		Integer = 2,
 		OctetString = 4,
@@ -106,6 +107,10 @@
 		}
 	}
 
+	void writeLengthIndefinite() {
+		output.put('\x80');
+	}
+
 	static bool isLittleEndian() {
 		int test = 1;
 		return (*(char *) &test);
@@ -133,20 +138,20 @@
 
 	void writeStartSequence() {
 		sequenceLevel++;
-		output.put('\x30');
-		output.put('\x80');
+		writeIdentifier(TagClass::Universal, PC::Constructed, UniversalType::Sequence);
+		writeLengthIndefinite();
 	}
 
 	void writeEndSequence() {
 		if (sequenceLevel == 0) throw cli::RelpipeCLIException(L"Unable to writeEndSequence() if not sequence is currently started.", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // should not happen, error in the program
 		sequenceLevel--;
-		output.put('\x00');
-		output.put('\x00');
+		writeIdentifier(TagClass::Universal, PC::Primitive, UniversalType::EndOfContent);
+		writeLength(0u);
 	}
 
 	void writeBoolean(const boolean_t& value) {
-		output.put('\x01');
-		output.put('\x01');
+		writeIdentifier(TagClass::Universal, PC::Primitive, UniversalType::Boolean);
+		writeLength(1u);
 		output.put(value ? '\xFF' : '\x00');
 
 	}