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diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/IRegistrySourceConnector.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/IRegistrySourceConnector.java
new file mode 100644
index 00000000..94c68d1b
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/registry/IRegistrySourceConnector.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2016, Abel Hegedus, IncQuery Labs Ltd.
+ * 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.registry;
+
+/**
+ * A registry source connector can provide query specifications to listeners (e.g. {@link IQuerySpecificationRegistry}).
+ * The connector interface does not support direct access to query specifications, instead it sends existing specifications
+ * to listeners on addition and sends notifications to listeners when a change occurs in the set of specifications.
+ * 
+ * @author Abel Hegedus
+ * @since 1.3
+ *
+ */
+public interface IRegistrySourceConnector {
+
+    /**
+     * The connector must return the same identifier every time it is invoked!
+     * 
+     * @return unique identifier of the connector
+     */
+    String getIdentifier();
+
+    /**
+     * 
+     * @return true if the specifications of the connector should be included in default views
+     */
+    boolean includeSpecificationsInDefaultViews();
+    
+    /**
+     * Add a listener to get updates on changes in the query specifications available from the connector. When the
+     * listener is added, the connector is expected to call the listener with each existing query specification.
+     * 
+     * @param listener that should be added
+     */
+    void addListener(IConnectorListener listener);
+
+    /**
+     * Removes an already registered listener and stops sending updates. The connector is not required to send any
+     * updates before returning from this method, but should not send any events after this method returns.
+     * 
+     * @param listener that should be removed
+     */
+    void removeListener(IConnectorListener listener);
+}