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								ID							 
																	A unique identifier for the object.								
															 
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								Role							 
																	The role that is assigned to the user.								
															 
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								Space							 
																	The space in which the role is assigned to the user.								
															 
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								User							 
																	The user whose role this defines.								
															 
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								Version							 
																	The version is used for optimistic locking and incremented whenever the object is updated.