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diff --git a/bundles/org.simantics.db/src/org/simantics/db/request/WriteInterface.java b/bundles/org.simantics.db/src/org/simantics/db/request/WriteInterface.java
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+++ b/bundles/org.simantics.db/src/org/simantics/db/request/WriteInterface.java
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+package org.simantics.db.request;
+
+import org.simantics.db.AsyncRequestProcessor;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Session;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.procedure.Procedure;
+
+/**
+ * 
+ * An interface representing a modification into the semantic database with a result value.
+ * <ul>
+ * <li>{@link WriteRequest} for writing with no result value
+ * <li>{@link WriteOnlyRequest} for writing in write only mode
+ * <li>{@link DelayedWriteRequest} for writing in delayed write mode
+ * </ul>
+ * <p>
+ * 
+ * The client is not expected to implement this class but rather to extend one of the standard implementations.
+ * 
+ * @version 1.5
+ * @author Antti Villberg
+ * @see ReadInterface
+ * @see RequestProcessor
+ * @see ReadGraph
+ * @see Session
+ */
+
+public interface WriteInterface<Result> {
+
+	Result request(RequestProcessor processor) throws DatabaseException;
+	void request(AsyncRequestProcessor processor, Procedure<Result> procedure);
+	
+}