--- a/src/lib/DOMBuildingSAXContentHandler.h	Sat Jun 12 19:15:58 2021 +0200
+++ b/src/lib/DOMBuildingSAXContentHandler.h	Sat Jun 12 20:31:23 2021 +0200
@@ -35,15 +35,18 @@
 		document->create_root_node("DOMBuildingSAXContentHandler"); // FIXME: real implementation
 	}
 
-	void abc() override {
-		document->get_root_node()->add_child("abc");
-	};
+	void writeStartElement(const std::string& name, const std::vector<std::string>& attributes) override {
+	}
+
+	void writeEndElement() override {
+	}
 
-	void def(int a) override {
-	};
+	void writeCharacters(const std::string& text) override {
+	}
 
-	void ghi(int a, int b) override {
-	};
+	void writeComment(const std::string& text, bool addSpaces) override {
+		document->get_root_node()->add_child_comment(addSpaces ? " " + text + " " : text);
+	}
 
 };
 

--- a/src/lib/GenericASN1ContentHandler.h	Sat Jun 12 19:15:58 2021 +0200
+++ b/src/lib/GenericASN1ContentHandler.h	Sat Jun 12 20:31:23 2021 +0200
@@ -42,7 +42,7 @@
 	}
 
 	void abc() override {
-		handlers.abc();
+		handlers.writeComment("abc");
 	};
 
 	void def(int a) override {

--- a/src/lib/SAXContentHandler.h	Sat Jun 12 19:15:58 2021 +0200
+++ b/src/lib/SAXContentHandler.h	Sat Jun 12 20:31:23 2021 +0200
@@ -26,13 +26,14 @@
 
 	virtual ~SAXContentHandler() = default;
 
-	virtual void abc() = 0; // FIXME: remove dummy method
-	virtual void def(int a) = 0; // FIXME: remove dummy method
-	virtual void ghi(int a, int b) = 0; // FIXME: remove dummy method
+	virtual void writeStartElement(const std::string& name, const std::vector<std::string>& attributes = {}) = 0;
+	virtual void writeEndElement() = 0;
+	virtual void writeCharacters(const std::string& text) = 0;
+	virtual void writeComment(const std::string& text, bool addSpaces = true) = 0;
 
 };
 
-class SAXContentHandlerProxy : public SAXContentHandler {
+class SAXContentHandlerProxy : SAXContentHandler {
 private:
 	std::vector<std::shared_ptr<SAXContentHandler>> handlers;
 public:
@@ -43,16 +44,20 @@
 
 #define handler for (auto ___h : handlers) ___h
 
-	void abc() override {
-		handler->abc();
+	void writeStartElement(const std::string& name, const std::vector<std::string>& attributes = {}) {
+		handler->writeStartElement(name, attributes);
 	}
 
-	void def(int a) override {
-		handler->def(a);
+	void writeEndElement() {
+		handler->writeEndElement();
 	}
 
-	void ghi(int a, int b) override {
-		handler->ghi(a, b);
+	void writeCharacters(const std::string& text) {
+		handler->writeCharacters(text);
+	}
+
+	void writeComment(const std::string& text, bool addSpaces = true) {
+		handler->writeComment(text, addSpaces);
 	}
 
 #undef handler