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diff --git a/tikzit/src/common/GraphElementProperty.h b/tikzit/src/common/GraphElementProperty.h
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+//
+//  GraphElementProperty.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 GraphElementProperty
+ @brief A property. I.e. a single entry in a node's/edge's/graph's 
+        GraphElementData table.
+ */
+@interface GraphElementProperty : NSObject {
+	NSString *key;
+	NSString *value;
+	BOOL isAtom;
+	BOOL isKeyMatch;
+}
+
+@property (readwrite,retain) NSString *key;
+@property (readwrite,retain) NSString *value;
+@property (readonly) BOOL isAtom;
+@property (readonly) BOOL isKeyMatch;
+
+/*!
+ @brief      Initialize a new key-matching object.
+ @param      k a key to match
+ @result     A key-matching object.
+ */
+- (id)initWithKeyMatching:(NSString*)k;
+
+/*!
+ @brief      Initialize a new atomic property.
+ @param      n the atom's name
+ @result     An atom.
+ */
+- (id)initWithAtomName:(NSString*)n;
+
+/*!
+ @brief      Initialize a new property.
+ @param      v the property's value
+ @param      k the associated key
+ @result     A property.
+ */
+- (id)initWithPropertyValue:(NSString*)v forKey:(NSString*)k;
+
+/*!
+ @brief      A matching function for properties.
+ @details    Two properties match iff their keys match and one of the following:
+             (a) they are both atomic, (b) one is a key-matching and one is a non-atomic
+             property, or (c) they are both non-atomic and their values match.
+ @param      object another GraphElementProperty
+ @result     A boolean.
+ */
+- (BOOL)matches:(GraphElementProperty*)object;
+
+/*!
+ @brief      An alias for <tt>matches:</tt>. This allows one to use built-in methods that
+             filter on <tt>isEqual:</tt> for <tt>NSObject</tt>s.
+ @param      object another GraphElementProperty
+ @result     A boolean.
+ */
+- (BOOL)isEqual:(id)object;
+
+/*!
+ @brief      Make a deep copy of this property.
+ @result     A new property.
+ */
+- (id)copy;
+
+@end
+
+// vi:ft=objc:noet:ts=4:sts=4:sw=4