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diff --git a/src/main/java/org/pdfbox/cos/ICOSVisitor.java b/src/main/java/org/pdfbox/cos/ICOSVisitor.java
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+/**
+ * Copyright (c) 2003, www.pdfbox.org
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 3. Neither the name of pdfbox; nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * http://www.pdfbox.org
+ *
+ */
+package org.pdfbox.cos;
+
+import org.pdfbox.exceptions.COSVisitorException;
+
+/**
+ * An interface for visiting a PDF document at the type (COS) level.
+ *
+ * @author Michael Traut
+ * @version $Revision: 1.6 $
+ */
+public interface ICOSVisitor
+{
+    /**
+     * Notification of visit to Array object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromArray( COSArray obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to boolean object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromBoolean( COSBoolean obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to dictionary object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromDictionary( COSDictionary obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to document object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromDocument( COSDocument obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to float object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromFloat( COSFloat obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to integer object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromInt( COSInteger obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to name object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromName( COSName obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to null object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromNull( COSNull obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to stream object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromStream( COSStream obj ) throws COSVisitorException;
+
+    /**
+     * Notification of visit to string object.
+     *
+     * @param obj The Object that is being visited.
+     * @return any Object depending on the visitor implementation, or null
+     * @throws COSVisitorException If there is an error while visiting this object.
+     */
+    public Object visitFromString( COSString obj ) throws COSVisitorException;
+}
+\ No newline at end of file