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diff --git a/common/plugins/org.eclipse.jpt.common.core/src/org/eclipse/jpt/common/core/resource/java/JavaResourceTypeCache.java b/common/plugins/org.eclipse.jpt.common.core/src/org/eclipse/jpt/common/core/resource/java/JavaResourceTypeCache.java
new file mode 100644
index 0000000000..59d5e7e883
--- /dev/null
+++ b/common/plugins/org.eclipse.jpt.common.core/src/org/eclipse/jpt/common/core/resource/java/JavaResourceTypeCache.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2009, 2011 Oracle. 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:
+ *     Oracle - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.jpt.common.core.resource.java;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.jdt.core.IType;
+
+/**
+ * Java persistent type cache - used to hold "external" types
+ * 
+ * Provisional API: This interface is part of an interim API that is still
+ * under development and expected to change significantly before reaching
+ * stability. It is available at this early stage to solicit feedback from
+ * pioneering adopters on the understanding that any code that uses this API
+ * will almost certainly be broken (repeatedly) as the API evolves.
+ * 
+ * @version 2.3
+ * @since 2.2
+ */
+public interface JavaResourceTypeCache
+	extends JavaResourceNode.Root
+{
+
+	/**
+	 * Return the size of the cache's types.
+	 */
+	int getTypesSize();
+
+	/**
+	 * Add a Java resource type for the specified JDT type to the
+	 * cache. Return the new type.
+	 */
+	JavaResourceAbstractType addType(IType jdtType);
+
+	/**
+	 * Remove all the types associated with the specified JAR file.
+	 * Return whether any types were removed.
+	 */
+	boolean removeTypes(IFile jarFile);
+
+}