diff -r 6ef41443211e -r 85b6f13f1088 src/lib/GenericASN1ContentHandler.h
--- a/src/lib/GenericASN1ContentHandler.h	Thu Jul 22 01:06:14 2021 +0200
+++ b/src/lib/GenericASN1ContentHandler.h	Thu Jul 22 20:01:03 2021 +0200
@@ -22,6 +22,7 @@
 
 #include "ASN1ContentHandler.h"
 #include "XMLContentHandler.h"
+#include "uri.h"
 
 namespace relpipe {
 namespace in {
@@ -37,6 +38,18 @@
 private:
 	XMLContentHandlerProxy handlers;
 
+	std::string rootName = "asn1";
+	bool treeWithNamespaces = false;
+
+	/**
+	 * TODO: use a common method
+	 */
+	bool parseBoolean(const std::string& value) {
+		if (value == "true") return true;
+		else if (value == "false") return false;
+		else throw std::invalid_argument(std::string("Unable to parse boolean value: ") + value + " (expecting true or false)");
+	}
+
 	std::vector<std::string> getCommonAttributes(const Header& header, std::vector<std::string> attributes = {}) {
 		std::string tag = std::to_string(header.tag);
 		std::string tagClass = std::to_string((uint64_t) header.tagClass);
@@ -80,8 +93,20 @@
 	virtual ~GenericASN1ContentHandler() {
 	}
 
+	bool setOption(const std::string& uri, const std::string& value) override {
+		if (uri == xml::RootName) rootName = value;
+		else if (uri == xml::TreeWithNamespaces) treeWithNamespaces = parseBoolean(value);
+		else if (uri == xml::TreeStyle && value == "standard"); // the only style currently supported
+		else if (uri == xml::TreeStyle && value == "literal") throw std::invalid_argument("Tree style 'literal' is not yet supported"); // will require ASN.1 schema, might be implemented in another class
+		else if (uri == xml::TreeStyle) throw std::invalid_argument("Unsupported tree-style: " + value);
+		else return false;
+
+		return true;
+	}
+
 	void writeStreamStart() override {
-		handlers.writeStartElement("asn1");
+		if (treeWithNamespaces) handlers.writeStartElement(rootName,{"xmlns", xml::XMLNS}); // TODO: actual namespace instead of a mere attribute
+		else handlers.writeStartElement(rootName);
 	}
 
 	void writeStreamEnd() override {