--- a/src/DeserializeHandler.h	Sun Apr 17 21:24:32 2022 +0200
+++ b/src/DeserializeHandler.h	Tue Apr 19 23:17:15 2022 +0200
@@ -32,6 +32,7 @@
 #include <relpipe/cli/RelpipeCLIException.h>
 
 #include "Configuration.h"
+#include "UnionAllHandler.h"
 
 namespace relpipe {
 namespace tr {
@@ -41,18 +42,84 @@
 private:
 	Configuration configuration;
 	shared_ptr<relpipe::writer::RelationalWriter> writer;
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor;
+	UnionAllHandler unionAllHandler;
 
+	class RelationContext {
+	public:
+		relpipe::common::type::StringX name;
+		std::vector<relpipe::reader::handlers::AttributeMetadata> readerMetadata;
+		std::vector<relpipe::writer::AttributeMetadata> writerMetadata;
+	} relationContext;
+
+	class RecordContext {
+	public:
+		std::stringstream buffer;
+		size_t attributeIndex = 0;
+	} recordContext;
+
+	char fromHex(wchar_t ch) {
+		if (L'0' <= ch && ch <= L'9') return ch - L'0';
+		else if (L'a' <= ch && ch <= L'f') return ch - L'a' + 10;
+		else throw relpipe::reader::RelpipeReaderException(L"Unable to decode hexadeximal string.");
+	}
+
+	std::stringstream fromHex(const relpipe::common::type::StringX& hex) {
+		std::stringstream octets;
+
+		char octet = 0;
+
+		for (size_t i = 0, limit = hex.size(); i < limit; i++) {
+			if (i % 2 == 0) {
+				octet = fromHex(hex[i]) << 4;
+			} else {
+				octet += fromHex(hex[i]);
+				octets.put(octet);
+			}
+		}
+
+		return octets;
+	}
+	
 public:
 
-	DeserializeHandler(shared_ptr<relpipe::writer::RelationalWriter> writer, Configuration configuration) : writer(writer), configuration(configuration) {
+	DeserializeHandler(shared_ptr<relpipe::writer::RelationalWriter> writer, Configuration configuration) : writer(writer), configuration(configuration), unionAllHandler(writer, configuration) {
+		// TODO: configurable relation name?
+		// TODO: configurable attribute name?
+		// TODO: optional custom attributes with constant value or ordinal number?
+		// TODO: optional deserialization of only certain relations? and certain fields?
+		// TODO: optional pass-through of certain relations?
 	}
 
 	virtual ~DeserializeHandler() = default;
 
 	void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
+		relationContext = RelationContext();
+
+		relationContext.name = name;
+		relationContext.readerMetadata = attributes;
+
+		for (relpipe::reader::handlers::AttributeMetadata readerMetadata : attributes) {
+			relationContext.writerMetadata.push_back({readerMetadata.getAttributeName(), writer->toTypeId(readerMetadata.getTypeName())});
+		}
 	}
 
 	void attribute(const relpipe::common::type::StringX& value) override {
+		auto attributeName = relationContext.readerMetadata[recordContext.attributeIndex].getAttributeName();
+
+		if (recordContext.attributeIndex == 0) recordContext = RecordContext();
+
+		if (attributeName == L"data") recordContext.buffer = fromHex(value);
+
+		recordContext.attributeIndex++;
+
+		if (recordContext.attributeIndex % relationContext.readerMetadata.size() == 0) {
+			std::stringstream octets = fromHex(value); // TODO: skip this step once we have octet-string data type + typed values instead of strings
+			std::shared_ptr<relpipe::reader::RelationalReader> reader(relpipe::reader::Factory::create(octets));
+			reader->addHandler(&unionAllHandler);
+			reader->process();
+			recordContext.attributeIndex = 0;
+		}
 	}
 
 	void endOfPipe() {