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diff --git a/org.eclipse.jface.text/src/org/eclipse/jface/text/contentassist/ICompletionProposalExtension.java b/org.eclipse.jface.text/src/org/eclipse/jface/text/contentassist/ICompletionProposalExtension.java
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+/**********************************************************************
+Copyright (c) 2000, 2002 IBM Corp. and others.
+All rights reserved. This program and the accompanying materials
+are made available under the terms of the Common Public License v1.0
+which accompanies this distribution, and is available at
+http://www.eclipse.org/legal/cpl-v10.html
+
+Contributors:
+    IBM Corporation - Initial implementation
+**********************************************************************/
+
+package org.eclipse.jface.text.contentassist;
+
+
+import org.eclipse.jface.text.IDocument;
+
+
+/**
+ * Extension interface to <code>ICompletionProposal</code>.
+ * Add the following functions:
+ * <ul>
+ * <li> handling of trigger characters other then ENTER
+ * <li> completion proposal validation for a given offset
+ * <li> freely positionable context information
+ * </ul>
+ * 
+ * @since 2.0
+ */
+public interface ICompletionProposalExtension {
+	
+	/**
+	 * Applies the proposed completion to the given document. The insertion
+	 * has been triggered by entering the given character at the given offset.
+	 * This method assumes that <code>isValidFor</code> returns
+	 * <code>true</code> if called for <code>offset</code>.
+	 *
+	 * @param document the document into which to insert the proposed completion
+	 * @param trigger the trigger to apply the completion
+	 * @param offset the offset at which the trigger has been activated
+	 */
+	void apply(IDocument document, char trigger, int offset);
+	
+	/**
+	 * Returns whether this completion proposal is valid for the given
+	 * position in the given document.
+	 * 
+	 * @param document the document for which the proposal is tested
+	 * @param offset the offset for which the proposal is tested
+	 */
+	boolean isValidFor(IDocument document, int offset);
+	
+	/**
+	 * Returns the characters which trigger the application of this completion proposal.
+	 * 
+	 * @return the completion characters for this completion proposal or <code>null</code>
+	 *		if no completion other than the new line character is possible
+	 */
+	char[] getTriggerCharacters();
+	
+	/**
+	 * Returns the position to which the computed context information refers to or
+	 * <code>-1</code> if no context information can be provided by this completion proposal.
+	 * 
+	 * @return the position to which the context information refers to or <code>-1</code> for no information
+	 */
+	int getContextInformationPosition();
+}