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			15 lines
		
	
	
		
			600 B
		
	
	
	
		
			Plaintext
		
	
	
	
	
	
| ================================================================
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| Logtalk - Open source object-oriented logic programming language
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| Release 2.30.7
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| 
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| Copyright (c) 1998-2007 Paulo Moura.  All Rights Reserved.
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| ================================================================
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| 
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| 
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| To load this example and for sample queries, please see the SCRIPT file.
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| 
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| In this example we have several types of polygons that can be concentric.
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| This is represented by a concentric binary relation ensuring that whenever 
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| a polygon is moved towards a new position, all polygons likewise concentric 
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| are moved along with them.
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