--- a/src/Configuration.h	Tue Feb 05 12:41:54 2019 +0100
+++ b/src/Configuration.h	Tue Feb 05 20:40:32 2019 +0100
@@ -49,24 +49,38 @@
 	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;
+
 	/**
 	 * Variable definitions for this relation.
 	 * Can be used as a safe way for passing parameters from the outside environment.
 	 * See also Configuration::definitions (can be overridden by relation's definitions)
 	 */
 	std::vector<DefinitionRecipe> definitions;
+
 	/**
 	 * If empty, output relation will have same metadata as the input relation.
 	 */
 	std::vector<relpipe::writer::AttributeMetadata> writerMetadata;
+
+	/**
+	 * Whether original attributes should be appended to those specified using --output-attribute
+	 */
+	bool inputAttributesAppend = false;
+
+	/**
+	 * Whether original attributes should be prepended to those specified using --output-attribute
+	 */
+	bool inputAttributesPrepend = false;
 };
 
 class Configuration {
 public:
+
 	vector<RelationConfiguration> relationConfigurations;
 	/**
 	 * Global definitions for all relations.