Aggregating server comprising a control logic including a first interface node and a second interface node, and a first and a second proxy node (112, 114) in an aggregated address space, wherein the aggregating server is an Open Platform Communications Unified Architecture, OPC UA aggregating server; wherein the first proxy node corresponds to a first node in a remote address space of an aggregated server, and a second proxy node corresponds to a second node in the remote address space of an aggregated server; wherein the control logic is configured to forward node data from the first node in the remote address space via the first proxy node and the second proxy node to the second node in the remote address space according to an input/output relationship; wherein the first proxy node and the second proxy node comprise meta information; wherein the meta information comprises a data type definition describing whether a data type of a proxy node is read data type defining that the data is to be read by an interface node (106, 108) or whether a data type of a proxy node (112, 114) is write data type defining that the data is to be written into the proxy node (112, 114) and the data to be forwarded is output data from the interface node (106, 108); wherein the input/output relationship between an interface node (106, 108) and a proxy node (112, 114) is defined by the read- or write data type such that an interface node has an input relationship with respect to the proxy node if the meta information describes a read data type for the proxy node data, and an interface node has an output relationship with respect to the proxy node if the meta information describes is a write data type for the proxy node data; and the first proxy node data is of read data type and the second proxy node is of write data type; wherein further a reference in the aggregating address space defines a relationship between the first proxy node and the second proxy node; and wherein the first proxy node is defined as forwarding source of the node data to be forwarded according to the input/output relationship between the first interface node and the first proxy node, and the reference; and wherein the second proxy node is defined as forwarding target of the node data to be forwarded according to the input/output relationship between the second interface node and the second proxy node, and the reference. a control logic including a first interface node and a second interface node, and a first and a second proxy node (112, 114) in an aggregated address space, wherein the aggregating server is an Open Platform Communications Unified Architecture, OPC UA aggregating server; wherein the first proxy node corresponds to a first node in a remote address space of an aggregated server, and a second proxy node corresponds to a second node in the remote address space of an aggregated server; wherein the control logic is configured to forward node data from the first node in the remote address space via the first proxy node and the second proxy node to the second node in the remote address space according to an input/output relationship; wherein the first proxy node and the second proxy node comprise meta information; wherein the meta information comprises a data type definition describing whether a data type of a proxy node is read data type defining that the data is to be read by an interface node (106, 108) or whether a data type of a proxy node (112, 114) is write data type defining that the data is to be written into the proxy node (112, 114) and the data to be forwarded is output data from the interface node (106, 108); wherein the input/output relationship between an interface node (106, 108) and a proxy node (112, 114) is defined by the read- or write data type such that an interface node has an input relationship with respect to the proxy node if the meta information describes a read data type for the proxy node data, and an interface node has an output relationship with respect to the proxy node if the meta information describes is a write data type for the proxy node data; and the first proxy node data is of read data type and the second proxy node is of write data type; wherein further a reference in the aggregating address space defines a relationship between the first proxy node and the second proxy node; and wherein the first proxy node is defined as forwarding source of the node data to be forwarded according to the input/output relationship between the first interface node and the first proxy node, and the reference; and wherein the second proxy node is defined as forwarding target of the node data to be forwarded according to the input/output relationship between the second interface node and the second proxy node, and the reference.