diff -r d70ea23682aa -r fb717cfbfea1 src/INICommand.cpp
--- a/src/INICommand.cpp	Sun Nov 22 19:22:25 2020 +0100
+++ b/src/INICommand.cpp	Mon Nov 23 16:25:57 2020 +0100
@@ -73,6 +73,7 @@
 		if (configuration.enableSubKeys) metadata.push_back({L"sub_key", TypeId::STRING});
 		metadata.push_back({L"value", TypeId::STRING});
 		if (configuration.enableComments) metadata.push_back({L"comment", TypeId::STRING});
+		if (configuration.enableWhitespace) metadata.push_back({L"whitespace", TypeId::STRING});
 		writer->startRelation(configuration.relation, metadata, true);
 	};
 
@@ -102,9 +103,47 @@
 
 		writer->writeAttribute(convertor.from_bytes(event.value));
 		if (configuration.enableComments) writer->writeAttribute(convertor.from_bytes(event.comment));
+		if (configuration.enableWhitespace) writer->writeAttribute(L"");
 	};
 
-	// TODO: handle also comments and whitespace (to allow lossless transformation from INI and back to INI)
+	void comment(const CommentEvent& event) override {
+		if (configuration.enableComments) {
+			if (configuration.enableLineNumbers) writer->writeAttribute(&event.lineNumber, typeid (event.lineNumber));
+			if (configuration.enableEventNumbers) writer->writeAttribute(&event.eventNumber, typeid (event.eventNumber));
+
+			std::string section = getCurrentSectionFullName();
+			std::string key;
+
+			if (configuration.enableSections) writer->writeAttribute(convertor.from_bytes(section));
+			else if (section.size()) key = section + "/";
+			writer->writeAttribute(convertor.from_bytes(key));
+
+			if (configuration.enableSubKeys) writer->writeAttribute(L"");
+			writer->writeAttribute(L""); // value
+			writer->writeAttribute(convertor.from_bytes(event.comment));
+			if (configuration.enableWhitespace) writer->writeAttribute(L"");
+		}
+	}
+
+	void whitespace(const WhitespaceEvent& event) override {
+		if (configuration.enableWhitespace) {
+			if (configuration.enableLineNumbers) writer->writeAttribute(&event.lineNumber, typeid (event.lineNumber));
+			if (configuration.enableEventNumbers) writer->writeAttribute(&event.eventNumber, typeid (event.eventNumber));
+
+			std::string section = getCurrentSectionFullName();
+			std::string key;
+
+			if (configuration.enableSections) writer->writeAttribute(convertor.from_bytes(section));
+			else if (section.size()) key = section + "/";
+			writer->writeAttribute(convertor.from_bytes(key));
+
+			if (configuration.enableSubKeys) writer->writeAttribute(L"");
+			writer->writeAttribute(L""); // value
+			if (configuration.enableComments) writer->writeAttribute(L"");
+			writer->writeAttribute(convertor.from_bytes(event.whitespace));
+		}
+	}
+	// TODO: unify methods, DRY
 
 };