ISO 2146 (Registry Services for Libraries and Related Organisations) is an international standard currently under development by ISO TC46 SC4 WG7 to operate as a framework for building registry services for libraries and related organisations. It takes the form of an information model that identifies the objects and data elements needed for the collaborative construction of registries of all types. It is not bound to any specific protocol or data schema. The aim is to be as abstract as possible, in order to facilitate a shared understanding of the common processes involved, across multiple communities of practice.
This schema is currently referred to as "NISO Metadata for Images in XML (NISO MIX)". MIX is expressed using the XML schema language of the World Wide Web Consortium. MIX is maintained for NISO by the Network Development and MARC Standards Office of the Library of Congress with input from users.
This guide is a relatively brief overview of the PREMIS preservation metadata standard. It will not give you enough information to implement PREMIS, but it will give you some idea of what PREMIS is all about. For many readers, this will be enough. For those who do need to master the PREMIS Data Dictionary for Preservation Metadata, this guide may serve as a gentle introduction that makes the larger document feel more familiar.