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diff --git a/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/IterableIndexer.java b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/IterableIndexer.java
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index 00000000..d6f8ef05
--- /dev/null
+++ b/subprojects/viatra-runtime-rete/src/main/java/tools/refinery/viatra/runtime/rete/index/IterableIndexer.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2004-2009 Gabor Bergmann and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+
+package tools.refinery.viatra.runtime.rete.index;
+
+import tools.refinery.viatra.runtime.matchers.tuple.Tuple;
+
+/**
+ * An indexer that allows the iteration of all retrievable tuple groups (or reduced groups).
+ * 
+ * @author Gabor Bergmann
+ * 
+ */
+public interface IterableIndexer extends Indexer, Iterable<Tuple> {
+
+    /**
+     * A view consisting of exactly those signatures whose tuple group is not empty
+     * @since 2.0
+     */
+    public Iterable<Tuple> getSignatures();
+
+    /**
+     * @return the number of signatures whose tuple group is not empty
+     * @since 2.0
+     */
+    public int getBucketCount();
+    
+}