diff -r fe894bb075c2 -r 79f826a55db2 mds_plat/metadata_engine_api/inc/mderelationdef.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mds_plat/metadata_engine_api/inc/mderelationdef.h	Wed Oct 06 15:08:08 2010 +0300
@@ -0,0 +1,89 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  ?Description
+*
+*/
+
+#ifndef __MDERELATIONDEF_H__
+#define __MDERELATIONDEF_H__
+
+
+#include <e32base.h>
+
+#include <mdccommon.h>
+
+// Forward declaration
+class CMdCSerializationBuffer;
+class CMdENamespaceDef;
+class TMdCRelationDef;
+
+
+/**
+ * Relation definition.
+ */
+NONSHARABLE_CLASS(CMdERelationDef) : public CBase
+	{
+public:	
+
+	static CMdERelationDef* NewL(const TMdCRelationDef& aRelationDef, CMdCSerializationBuffer& aSchemaBuffer,
+			CMdENamespaceDef& aNamespaceDef);
+
+	static CMdERelationDef* NewLC(const TMdCRelationDef& aRelationDef, CMdCSerializationBuffer& aSchemaBuffer,
+			CMdENamespaceDef& aNamespaceDef);
+
+	/**
+	 * Returns the name of the item.
+	 *
+	 * @return  name
+	 */
+	IMPORT_C const TDesC& Name() const;
+
+	/**
+	 * Compare this relation definition with other relation definition.
+	 *
+	 * @param aRelationDef other relation definition
+	 *
+	 * @return  0 if relations are same, 1 or more if this is greater than other 
+	 *          and -1 or less if this is less than other.
+	 */
+	IMPORT_C TInt Compare(const CMdERelationDef& aRelationDef) const;
+
+	/**
+	 * Returns namespace definition of namespace which contains this relation
+	 * @return namespace definition of relation
+	 */
+	IMPORT_C CMdENamespaceDef& NamespaceDef() const;
+
+public:		
+
+	/**
+	 * Destructor.
+	 */
+	virtual ~CMdERelationDef();
+
+	TDefId Id() const;
+
+private:
+	CMdERelationDef(const TMdCRelationDef& aRelationDef, CMdENamespaceDef& aNamespaceDef);
+
+	void ConstructL(CMdCSerializationBuffer& aSchemaBuffer);
+
+private:
+	const TMdCRelationDef& iRelationDef;
+	CMdENamespaceDef& iNamespaceDef;
+
+	TPtrC16 iName;
+	};
+
+#endif  // __MDERELATIONDEF_H__