The QuickGraph namespace contains default vertex and edge implementations.

QuickGraph Library License

            Copyright (c) 2004 Jonathan de Halleux
            
            This software is provided 'as-is', without any express or implied warranty. 
            
            In no event will the authors be held liable for any damages arising from 
            the use of this software.
            Permission is granted to anyone to use this software for any purpose, 
            including commercial applications, and to alter it and redistribute it 
            freely, subject to the following restrictions:
            
            1. The origin of this software must not be misrepresented; 
            you must not claim that you wrote the original software. 
            If you use this software in a product, an acknowledgment in the product 
            documentation would be appreciated but is not required.
            
            2. Altered source versions must be plainly marked as such, and must 
            not be misrepresented as being the original software.
            
            3. This notice may not be removed or altered from any source 
            distribution.
            	
            QuickGraph Library HomePage: http://www.mbunit.com
            Author: Jonathan de Halleux