Here, public technical information related to the DLMS/COSEM specification and the international standards can be found.
For members, additional information is available after login to MyDLMS.
The excerpts of the DLMS UA "Coloured Books" are available here to facilitate understanding the main concepts.
To implement the specification the complete Books are necessary. They are available to all members of the DLMS User Association after logging in to myDLMS at Documents >> Technical.