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diff --git a/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/BindingProvider.java b/bundles/org.simantics.databoard/src/org/simantics/databoard/binding/reflection/BindingProvider.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2011 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.databoard.binding.reflection;
+
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.error.BindingConstructionException;
+
+/**
+ * Binding provider is an interface for providers that provide context-specific
+ * or hand-written bindings for the whole binding construction mechanism.
+ *
+ * @author toni.kalajainen@semantum.fi
+ */
+public interface BindingProvider {
+
+	/**
+	 * Construct a binding for a request. This method returns null if a binding
+	 * cannot be provided by this factory. Exception is thrown if construction
+	 * is expected to success but fails for a reason.
+	 *  
+	 * If this class constructs a compositive type: Array, Map, Optional, 
+	 * Record or Union, the composite types/fields need not be filled, and 
+	 * should be left null. They are filled by the caller.  
+	 * 
+	 * @param request
+	 * @param mainFactory master factory
+	 * @return binding or <code>null</code> 
+	 * @throws BindingConstructionException
+	 */
+	Binding provideBinding(ClassBindingFactory mainFactory, BindingRequest request) throws BindingConstructionException;
+	
+}