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diff --git a/src/common/GraphElementData.h b/src/common/GraphElementData.h
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+//
+//  GraphElementData.h
+//  TikZiT
+//  
+//  Copyright 2010 Aleks Kissinger. All rights reserved.
+//  
+//  
+//  This file is part of TikZiT.
+//  
+//  TikZiT 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 3 of the License, or
+//  (at your option) any later version.
+//  
+//  TikZiT 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 TikZiT.  If not, see <http://www.gnu.org/licenses/>.
+//  
+
+
+#import <Foundation/Foundation.h>
+
+/*!
+ @class      GraphElementData
+ @brief      Store extra data associated with a graph, node, or edge.
+ @details    Store the extra (style, ...) data associated with
+             a graph, node, or edge. This data is stored as a mutable
+             array of properties. It also implements hash-like accessors,
+             but care should be taken using these, as the list can contain
+             multiple occurrences of the same key.
+ 
+             Convention: Getters and setters act on the *first* occurrence
+             of the key. 'Unsetters' remove *all* occurrences.
+ */
+@interface GraphElementData : NSMutableArray {
+	NSMutableArray *properties;
+}
+
+
+/*!
+ @brief      Set the given value for the *first* property matching this key. Add a
+             new property if it doesn't already exist.
+ @param      val the value to set
+ @param      key the key for this property
+ */
+- (void)setProperty:(NSString*)val forKey:(NSString*)key;
+
+/*!
+ @brief      Remove *all* occurences of the property with the given key.
+ @param      key
+ */
+- (void)unsetProperty:(NSString*)key;
+
+/*!
+ @brief      Return the value of the *first* occurrence of the given key.
+ @param      key
+ */
+- (NSString*)propertyForKey:(NSString*)key;
+
+/*!
+ @brief      Add the given atom to the list, if it's not already present.
+ @param      atom
+ */
+- (void)setAtom:(NSString*)atom;
+
+/*!
+ @brief      Remove *all* occurrences of the given atom.
+ @param      atom
+ */
+- (void)unsetAtom:(NSString*)atom;
+
+/*!
+ @brief      Returns YES if the list contains at least one occurrence of
+             the given atom.
+ @param      atom
+ @result     A boolean value.
+ */
+- (BOOL)isAtomSet:(NSString*)atom;
+
+/*!
+ @brief      Returns a TikZ-friendly string containing all of the properties.
+ @result     A string.
+ */
+- (NSString*)stringList;
+
+- (id)copy;
+
+@end
+
+// vi:ft=objc:noet:ts=4:sts=4:sw=4