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diff --git a/logo/src/xlogo/interfaces/ErrorDetector.java b/logo/src/xlogo/interfaces/ErrorDetector.java
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+/* XLogo4Schools - A Logo Interpreter specialized for use in schools, based on XLogo by Lo�c Le Coq
+ * Copyright (C) 2013 Marko Zivkovic
+ * 
+ * Contact Information: marko88zivkovic at gmail dot com
+ * 
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public License as published by the Free 
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.  This program is distributed in the hope that it will be 
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 
+ * Public License for more details.  You should have received a copy of the 
+ * GNU General Public License along with this program; if not, write to the Free 
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
+ * MA 02110-1301, USA.
+ * 
+ * 
+ * This Java source code belongs to XLogo4Schools, written by Marko Zivkovic
+ * during his Bachelor thesis at the computer science department of ETH Z�rich,
+ * in the year 2013 and/or during future work.
+ * 
+ * It is a reengineered version of XLogo written by Lo�c Le Coq, published
+ * under the GPL License at http://xlogo.tuxfamily.org/
+ * 
+ * Contents of this file were entirely written by Marko Zivkovic
+ */
+
+package xlogo.interfaces;
+
+import java.util.Collection;
+import java.util.Map;
+
+import xlogo.kernel.userspace.ProcedureErrorMessage;
+import xlogo.kernel.userspace.procedures.Procedure;
+
+public interface ErrorDetector
+{
+	public boolean hasErrors();
+	
+	public Collection<ProcedureErrorMessage> getAllErrors();
+	
+	public interface FileErrorCollector extends ErrorDetector
+	{	
+		public boolean hasErrors(String fileName);
+		
+		public Collection<String> getAllErroneousFiles();
+		
+		public void addErrorListener(ErrorListener listener);
+		
+		public void removeErrorListener(ErrorListener listener);
+		
+		public interface ErrorListener
+		{
+			/**
+			 * This event is fired as soon as one or more errors are detected in a file
+			 * @param fileName
+			 */
+			public void errorsDetected(String fileName);
+			
+			/**
+			 * This event is fired as soon as all errors are removed from a document
+			 * @param fileName
+			 */
+			public void allErrorsCorrected(String fileName);
+		}
+	}
+	
+	public interface AmbiguityDetector extends ErrorDetector
+	{		
+		/**
+		 * @return Files whose procedures conflict with procedures of other files.
+		 */
+		public Collection<String> getAllConflictingFiles();
+		
+		/**
+		 * @param fileName
+		 * @return whether the specified file conflicts with some other file
+		 */
+		boolean hasAmbiguousProcedures(String fileName);
+		
+		/**
+		 * @param name
+		 * @return whether the specified procedure name is defined in more than one file.
+		 */
+		public boolean isProcedureAmbiguous(String procedureName);
+
+		
+		void addAmbiguityListener(AmbiguityListener listener);
+
+		void removeAmbiguityListener(AmbiguityListener listener);
+
+		
+		public interface AmbiguityListener
+		{
+			public void ambiguityDetected(String procedureName, Map<String, Procedure> fileToProcedure);
+			
+			/**
+			 * @param procedureName
+			 * @param fileName When a single file has lost ambiguity for that specific procedure (might still have other ambiguities)
+			 */
+			public void ambiguityResolved(String procedureName, String fileName);
+		}
+	}
+}