This standard BS EN 62056-53:2007 Electricity metering. Data exchange for meter reading, tariff and load control is classified in these ICS categories:
91.140.50 Electricity supply systems
35.100.70 Application layer
Specifies the COSEM application layer in terms of structure, services and protocols for COSEM clients and servers, and defines how to use the COSEM application layer in various communication profiles. It defines services for establishing and releasing application associations, and data communication services for accessing the methods and attributes of COSEM interface objects, defined in IEC 62056-62, using either logical name (LN) or short name (SN) referencing.
This publication is of high relevance for Smart Grid.