RelationAbstraction.php Relation abstraction class file. Tags copyright YetiForce S.A. license YetiForce Public License 6.5 (licenses/LicenseEN.txt or yetiforce.com) author Radosław Skrzypczak r.skrzypczak@yetiforce.com author Mariusz Krzaczkowski m.krzaczkowski@yetiforce.com Interfaces, Classes, Traits and Enums RelationAbstraction Relation abstraction class.