) is an auxiliary attribute subnode used by the Domain Decomposition (Schwarz) attribute node. This node does not have any settings. Instead, its purpose is to administrate domain solvers for a domain-decomposition Schwarz solver.) is an auxiliary attribute subnode used by the Domain Decomposition (Schwarz) attribute node. This node does not have any settings. Instead, its purpose is to administrate domain solvers for a domain-decomposition Schwarz solver.