diff -r 71b902e1c5ee -r e82aaf24b0fe src/ODSCommand.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/ODSCommand.h	Sun May 14 02:13:46 2023 +0200
@@ -0,0 +1,128 @@
+/**
+ * Relational pipes
+ * Copyright © 2023 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>
+
+namespace relpipe {
+namespace in {
+namespace ods {
+
+using namespace relpipe::writer;
+
+class ODSCommand {
+private:
+	std::wstring_convert<codecvt_utf8<wchar_t>> convertor;
+
+	xmlpp::Node::PrefixNsMap ns;
+	std::shared_ptr<RelationalWriter> writer;
+
+	string_t xpath(xmlpp::Node* node, std::string xpath) {
+		return convertor.from_bytes(node->eval_to_string(xpath, ns));
+	}
+
+	void processCell(xmlpp::Node* c, AttributeMetadata& am) {
+		string_t value = xpath(c, "@o:value");
+		if (value.size()) writer->writeAttribute(value);
+		else writer->writeAttribute(xpath(c, "tx:p"));
+		// TODO: be aware of the current data types
+	}
+
+	void processRow(xmlpp::Node* r, std::vector<AttributeMetadata>& am) {
+		for (int i = 0; i < am.size(); i++) {
+			auto xpe = std::string("t:table-cell[")
+					+ std::to_string(i + 1)
+					+ "]";
+			auto cells = r->find(xpe, ns);
+			if (cells.size() == 1) {
+				processCell(cells[0], am[i]);
+			} else {
+				writer->writeAttribute(L"");
+				// TODO: support also other data types
+			}
+		}
+
+		// FIXME: support sparse data / missing values:
+		// <table:table-row  table:number-rows-repeated="2">
+		// <table:table-cell table:number-columns-repeated="3"/>
+
+	}
+
+	void processTable(xmlpp::Node* t) {
+		auto relation = xpath(t, "@t:name");
+		std::vector<AttributeMetadata> metadata;
+
+		for (xmlpp::Node* c : t->find("t:table-row[1]/t:table-cell", ns)) {
+			auto name = xpath(c, "tx:p");
+			if (name.size()) {
+				metadata.push_back({name, TypeId::STRING});
+				// TODO: detect and support other data types
+			}
+		}
+
+		writer->startRelation(relation, metadata, true);
+
+		int i = 0;
+		for (xmlpp::Node* r : t->find("t:table-row", ns)) {
+			i++;
+			if (i == 1) continue; // skip header row
+			processRow(r, metadata);
+		}
+	}
+
+public:
+
+	ODSCommand(std::shared_ptr<RelationalWriter> writer) : writer(writer) {
+		ns["o"] = "urn:oasis:names:tc:opendocument:xmlns:office:1.0";
+		ns["t"] = "urn:oasis:names:tc:opendocument:xmlns:table:1.0";
+		ns["tx"] = "urn:oasis:names:tc:opendocument:xmlns:text:1.0";
+	}
+
+	void process(std::istream & input) {
+		xmlpp::DomParser parser;
+		parser.parse_stream(input);
+
+		xmlpp::Element* root = parser.get_document()->get_root_node();
+		auto spreadsheets = root->find("/o:document/o:body/o:spreadsheet", ns);
+
+		if (spreadsheets.size() == 1) {
+			for (xmlpp::Node* table : spreadsheets[0]->find("t:table", ns)) {
+				processTable(table);
+			}
+		} else {
+			throw RelpipeWriterException(L"Invalid XML structure. "
+					"Expecting OpenDocument spreadsheet.");
+		}
+
+
+	}
+};
+
+}
+}
+}