Summary and Outlook This document has defined the metamodel for the structural viewpoint of the Asset Administration Shell using the technology-neutral modelling language UML. Several serializations and mappings are offered for the Asset Administration Shell based on this specification: XML, mainly used for file exchange between partners via the exchange format .aasx, JSON, mainly used for API definition, but also for file exchange as alternative to XML, and RDF for reasoning. Additional parts of the document series cover (see [37]): interfaces and APIs for accessing the information of Asset Administration Shells (access, modify, query, and execute information and active functionality), Part 2; the payload of these APIs is based on the definitions of the information model in this document, Part 1, predefined data specification templates (Part 3 series), for example for concept descriptions of properties conformant to IEC61360 (Part 3a), the infrastructure, which hosts and interconnects multiple Asset Administration Shells, implementing registry, discovery services, endpoint handling, and more, security aspects including access control, Part 4.