diff -r d6dbd5d50d43 -r 426054465916 src/XPathHandler.h
--- a/src/XPathHandler.h	Wed Dec 30 00:39:03 2020 +0100
+++ b/src/XPathHandler.h	Wed Dec 30 01:28:45 2020 +0100
@@ -34,6 +34,7 @@
 #include <relpipe/cli/RelpipeCLIException.h>
 
 #include "Configuration.h"
+#include "XMLNameCodec.h"
 
 namespace relpipe {
 namespace tr {
@@ -41,14 +42,18 @@
 
 class XPathHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
 private:
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // XML is in UTF-8
 	shared_ptr<relpipe::writer::RelationalWriter> relationalWriter;
 	Configuration configuration;
-	RelationConfiguration* currentRelationConfiguration;
+	RelationConfiguration* currentRelationConfiguration = nullptr;
 	std::vector<relpipe::reader::handlers::AttributeMetadata> currentReaderMetadata;
 	std::vector<relpipe::writer::AttributeMetadata> currentWriterMetadata;
 	size_t currentAttributeIndex = 0;
-	
+
+
 	xmlpp::DomParser dom;
+	xmlpp::Element* recordElement = nullptr;
+	relpipe::in::xmltable::XMLNameCodec xmlNameCodec; // TODO: move to a common library
 
 	void copyInputAttributesToOutput() {
 		for (auto rm : currentReaderMetadata) currentWriterMetadata.push_back({rm.getAttributeName(), relationalWriter->toTypeId(rm.getTypeName())});
@@ -63,6 +68,35 @@
 		return currentRelationConfiguration->inputAttributePolicy == InputAttributePolicy::Append;
 	}
 
+	void resetRecordElement() {
+		if (recordElement) dom.get_document()->get_root_node()->remove_child(recordElement);
+		recordElement = dom.get_document()->get_root_node()->add_child("record");
+	}
+
+	const Glib::ustring s2x(relpipe::common::type::StringX value) {
+		return Glib::ustring(convertor.to_bytes(value));
+	}
+
+	const relpipe::common::type::StringX x2s(const Glib::ustring& value) {
+		return convertor.from_bytes(value);
+	}
+
+	void writeInputAttributes() {
+		for (xmlpp::Node* attributeNode : recordElement->get_children()) {
+			if (xmlpp::Element * attributeElement = dynamic_cast<xmlpp::Element*> (attributeNode)) {
+				auto value = attributeElement->get_child_text()->get_content();
+				relationalWriter->writeAttribute(x2s(value));
+			}
+		}
+	}
+
+	void writeOutputAttributes() {
+		for (auto oa : currentRelationConfiguration->outputAttributes) {
+			auto value = recordElement->eval_to_string(s2x(oa.xpath));
+			relationalWriter->writeAttribute(x2s(value));
+		}
+	}
+
 public:
 
 	XPathHandler(shared_ptr<relpipe::writer::RelationalWriter> relationalWriter, Configuration configuration) : relationalWriter(relationalWriter), configuration(configuration) {
@@ -92,6 +126,8 @@
 			if (isAppendingInputAttributes()) copyInputAttributesToOutput();
 
 			// TODO: prepare DOM
+			dom.get_document()->create_root_node("relpipe-tr-xpath");
+			resetRecordElement();
 		}
 
 		relationalWriter->startRelation(name, currentWriterMetadata, true);
@@ -101,15 +137,21 @@
 		if (currentRelationConfiguration) {
 			relpipe::reader::handlers::AttributeMetadata attributeMetadata = currentReaderMetadata[currentAttributeIndex];
 
-			// TODO: add attribute to DOM		
+			xmlpp::Element* attributeElement = recordElement->add_child(xmlNameCodec.encode(s2x(attributeMetadata.getAttributeName())));
+			attributeElement->set_attribute("name", s2x(attributeMetadata.getAttributeName()));
+			attributeElement->set_attribute("type", s2x(attributeMetadata.getTypeName()));
+			attributeElement->add_child_text(s2x(value));
 
 			currentAttributeIndex++;
 
 			if (currentAttributeIndex == currentReaderMetadata.size()) {
+				if (currentRelationConfiguration->where.empty() || recordElement->eval_to_boolean(s2x(currentRelationConfiguration->where))) {
+					if (isPrependingInputAttributes()) writeInputAttributes();
+					writeOutputAttributes();
+					if (isAppendingInputAttributes()) writeInputAttributes();
+				}
 
-				// TODO: evaluate XPath expression
-				// TODO: write record to output, if the XPath condition was met
-				// TODO: clean record node in DOM
+				resetRecordElement();
 				currentAttributeIndex = 0;
 			}
 		} else {