A minimum set of metadata elements ("Core Metadata") allows the seamless exchange of (meta)data related to the legal decision making process between the EU institutions, including the Publications Office of the European Union.
Extensions further define optional and institution specific metadata elements. The technical implementation of the Core Metadata and the extension metadata was done as a set of XML schemas.
To ensure smooth interoperability and long term stability, modifications to the IMMC schemas are subject to the governance applied by the Interinstitutional Metadata and Formats Committee (IMFC), metadata subgroup, successor of the original IMMC.
IMMC Core Metadata has two main lines of schemas:
IMMC Core Metadata 2 is mainly used for (meta)data exchanges between the EU institutions in the scope of the legal decision making process and related activities.
IMMC Core Metadata 3 is mainly used in the document production and archiving environment of the Publications Office.