diff -r 000000000000 -r ea26b3359fed src/XMLTableCommand.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/XMLTableCommand.h	Sat Jan 16 16:36:39 2021 +0100
@@ -0,0 +1,137 @@
+/**
+ * Relational pipes
+ * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+
+#include <cstdlib>
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <vector>
+#include <algorithm>
+#include <exception>
+#include <regex>
+
+#include <libxml++-2.6/libxml++/libxml++.h>
+
+#include <relpipe/writer/typedefs.h>
+
+#include "Configuration.h"
+#include "XMLDocumentConstructor.h"
+
+namespace relpipe {
+namespace in {
+namespace xmltable {
+
+using namespace relpipe::writer;
+
+class XMLCommand {
+private:
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
+
+	string_t formatRawXML(string_t rawXML) {
+		std::wregex pattern(L"^<\\?xml version=\"1.0\" encoding=\"UTF-8\"\\?>\n|\n$");
+		return std::regex_replace(rawXML, pattern, L"");
+	}
+
+	void importNode(xmlpp::Node* parent, xmlpp::Node* child, AttributeRecipe attributeRecipe) {
+		if (dynamic_cast<xmlpp::AttributeNode*> (child)) parent->add_child_with_new_ns(
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.name),
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.uri),
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.prefix))->import_node(child);
+		else parent->import_node(child, true);
+	}
+
+	void importNode(xmlpp::Document* document, xmlpp::Node* child, AttributeRecipe attributeRecipe) {
+		if (dynamic_cast<xmlpp::AttributeNode*> (child)) document->create_root_node(
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.name),
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.uri),
+				convertor.to_bytes(attributeRecipe.rawXmlAttributeWrapper.prefix))->import_node(child);
+		else document->create_root_node_by_import(child, true);
+	}
+
+	string_t toRawXML(xmlpp::Node* parent, AttributeRecipe attributeRecipe, xmlpp::Node::PrefixNsMap ns) {
+		xmlpp::Document d;
+		xmlpp::NodeSet nodes = parent->find(convertor.to_bytes(attributeRecipe.xpath), ns);
+
+		if (attributeRecipe.rawXmlNodeListWrapper.name.size()) {
+			d.create_root_node(
+					convertor.to_bytes(attributeRecipe.rawXmlNodeListWrapper.name),
+					convertor.to_bytes(attributeRecipe.rawXmlNodeListWrapper.uri),
+					convertor.to_bytes(attributeRecipe.rawXmlNodeListWrapper.prefix));
+			for (xmlpp::Node* node : nodes) importNode(d.get_root_node(), node, attributeRecipe);
+		} else {
+			if (nodes.size() == 1) importNode(&d, nodes[0], attributeRecipe);
+			else if (nodes.size() > 1) throw std::invalid_argument("Multiple nodes found where only one was expected. Use nodelist wrapper."); // TODO: better relpipe exception
+			else return L""; // TODO: null
+		}
+		return formatRawXML(convertor.from_bytes(d.write_to_string()));
+	}
+
+public:
+
+	void process(std::istream& input, std::ostream& output, Configuration& configuration) {
+		std::shared_ptr<RelationalWriter> writer(Factory::create(output));
+
+		xmlpp::DomParser parser;
+		XMLDocumentConstructor documentConstructor(&input, &parser);
+		for (ParserOptionRecipe o : configuration.parserOptions) documentConstructor.setOption(convertor.to_bytes(o.uri), convertor.to_bytes(o.value));
+		documentConstructor.process();
+		if (configuration.xinclude) parser.get_document()->process_xinclude(true);
+		xmlpp::Element* root = parser.get_document()->get_root_node();
+
+		xmlpp::Node::PrefixNsMap ns;
+		for (int i = 0; i < configuration.namespaceMappings.size(); i++) {
+			std::string prefix = convertor.to_bytes(configuration.namespaceMappings[i]);
+			std::string uri = convertor.to_bytes(configuration.namespaceMappings[++i]);
+			ns[prefix] = uri;
+		}
+
+		for (const RelationConfiguration& r : configuration.relationConfigurations) {
+			std::vector<relpipe::writer::AttributeMetadata> attributesMetadata;
+			for (AttributeRecipe a : r.attributes) attributesMetadata.push_back(AttributeMetadata{a.name, a.type});
+			relpipe::writer::string_t name = r.nameIsXPath ? convertor.from_bytes(root->eval_to_string(convertor.to_bytes(r.relation), ns)) : r.relation;
+			writer->startRelation(name, attributesMetadata, true);
+			for (xmlpp::Node* n : root->find(convertor.to_bytes(r.xpath), ns)) {
+				for (AttributeRecipe a : r.attributes) {
+					// TODO: convert to bytes only once
+					std::string attributeXpath = convertor.to_bytes(a.xpath);
+					if (a.mode == Mode::STRING) {
+						writer->writeAttribute(convertor.from_bytes(n->eval_to_string(attributeXpath, ns)));
+					} else if (a.mode == Mode::BOOLEAN) {
+						writer->writeAttribute(n->eval_to_boolean(attributeXpath, ns) ? L"true" : L"false");
+					} else if (a.mode == Mode::LINE_NUMBER) {
+						xmlpp::NodeSet attributeNodes = n->find(attributeXpath, ns);
+						string_t line = attributeNodes.size() ? std::to_wstring(attributeNodes[0]->get_line()) : L""; // TODO: null
+						writer->writeAttribute(line);
+					} else if (a.mode == Mode::XPATH) {
+						xmlpp::NodeSet attributeNodes = n->find(attributeXpath, ns);
+						string_t line = attributeNodes.size() ? convertor.from_bytes(attributeNodes[0]->get_path()) : L""; // TODO: null
+						writer->writeAttribute(line);
+					} else if (a.mode == Mode::RAW_XML) {
+						writer->writeAttribute(toRawXML(n, a, ns));
+					} else {
+						throw logic_error("Unsupported mode."); // should never happer, TODO: better relpipe exception
+					}
+				}
+			}
+		}
+	}
+};
+
+}
+}
+}