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diff --git a/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/internal/apiimpl/QueryResultWrapper.java b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/internal/apiimpl/QueryResultWrapper.java
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index 00000000..47f3268d
--- /dev/null
+++ b/subprojects/viatra-runtime/src/main/java/tools/refinery/viatra/runtime/internal/apiimpl/QueryResultWrapper.java
@@ -0,0 +1,32 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2014, Bergmann Gabor, Istvan Rath 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.internal.apiimpl;
+
+import tools.refinery.viatra.runtime.api.ViatraQueryEngine;
+import tools.refinery.viatra.runtime.matchers.backend.IMatcherCapability;
+import tools.refinery.viatra.runtime.matchers.backend.IQueryResultProvider;
+
+/**
+ * Internal class for wrapping a query result providing backend. It's only supported usage is by the
+ * {@link ViatraQueryEngineImpl} class.
+ * </p>
+ * 
+ * <strong>Important note</strong>: this class must not introduce any public method, as it will be visible through
+ * BaseMatcher as an API, although this class is not an API itself.
+ * 
+ * @author Bergmann Gabor
+ *
+ */
+public abstract class QueryResultWrapper {
+
+    protected IQueryResultProvider backend;
+
+    protected abstract void setBackend(ViatraQueryEngine engine, IQueryResultProvider resultProvider, IMatcherCapability capabilities);
+    
+}