AAS Specifications Specifications define the software structure, interface and semantics of the Asset Administration Shell and thus create the basis for the standardized Digital Twin. All specifications for the Asset Administration Shell information model can be found here. Release 25-01 Refer to the IDTA for more information on the Asset Administration Shell. Specification of the Asset Administration Shell Part 1: Metamodel IDTA Number: 01001 Version: v3.1 View Specification of the Asset Administration Shell Part 2: Application Programming Interfaces IDTA Number: 01002 Version: v3.1 View Specification of the Asset Administration Shell Part 3a: Data Specification – IEC 61360 IDTA Number: 01003-a Version: v3.1 View Specification of the Asset Administration Shell Part 4: Security IDTA Number: 01004 Version: v3.0 View Specification of the Asset Administration Shell Part 5: Package File Format (AASX) IDTA Number: 01005 Version: v3.1 View