"The Resource types named authority list (NAL) or Common Authority Table (CAT) is a controlled vocabulary listing resource or document types with their authority code and label(s) in the 24 official languages of the EU (when available).
The resource type authority table (AT) lists the different types of document (e.g. directive, regulation, etc.) used in the context of data exchange between the European institutions involved in the legal decision-making process. Set up in order to harmonise the various types of documents used by different systems and, in particular, used in the "Core Metadata and Extension Metadata XML schemas", the AT is part of the "Core Metadata". As regards the "Core Metadata", the AT is related to the event and corporate-body (Agent) authority tables.
The NAL is under the governance of the Interinstitutional Metadata Maintenance Committee (IMMC) and maintained by the Publications Office of the EU in its Metadata Registry (MDR)."