diff -r 17bb45570099 -r 4062b8436838 src/Configuration.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/Configuration.h	Sun Feb 03 01:44:07 2019 +0100
@@ -0,0 +1,76 @@
+/**
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 <vector>
+#include <tuple>
+
+#include <relpipe/writer/AttributeMetadata.h>
+#include <relpipe/writer/typedefs.h>
+
+namespace relpipe {
+namespace tr {
+namespace guile {
+
+class DefinitionRecipe {
+public:
+
+	virtual ~DefinitionRecipe() {
+	}
+
+	relpipe::writer::string_t name;
+	relpipe::writer::string_t type;
+	relpipe::writer::string_t value;
+};
+
+class RelationConfiguration {
+public:
+
+	virtual ~RelationConfiguration() {
+	}
+
+	relpipe::writer::string_t relation;
+	relpipe::writer::string_t guileBeforeRecords;
+	relpipe::writer::string_t guileAfterRecords;
+	relpipe::writer::string_t guileForEach;
+	relpipe::writer::string_t guileWhere;
+	/**
+	 * If true, Guile code will be executed, but no output will be generated.
+	 */
+	bool drop = false;
+	/**
+	 * 
+	 */
+	std::vector<DefinitionRecipe> definitions;
+	/**
+	 * If empty, output relation will have same metadata as the input relation.
+	 */
+	std::vector<relpipe::writer::AttributeMetadata> writerMetadata;
+};
+
+class Configuration {
+public:
+	vector<RelationConfiguration> relationConfigurations;
+
+	virtual ~Configuration() {
+	}
+};
+
+}
+}
+}
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