Geometry::AdditionalData is a vector of uints

	typedef std::pair<SizeType,SizeType> PairType;

	typedef Matrix<ComplexOrRealType> MatrixType;

	struct LocalData {

		LocalData(SizeType s1, SizeType s2)

		    : site1(s1), site2(s2)

		{}

		SizeType site1;

		SizeType site2;

	};

public:

	typedef LocalData AdditionalDataType;

	typedef Vector<SizeType>::Type AdditionalDataType;

	virtual ~GeometryBase()

	{}