The rules of this International Standard concern registries operating in a network environment to provide the information about collections, parties, activities and services needed by libraries and related organizations to manage their collections and deliver information and documentation services across a range of applications and domains. The International Standard takes the form of a data element directory that may be used as a framework for collecting the appropriate data and sharing it with other registry services, providing access to registry data through standard protocols whenever it is needed as part of an automated business workflow, publishing registries in electronic or print form and archiving registry data when the data exists only in electronic form. Particular attention is paid in the International Standard to the needs of national registries published in bi- or multilingual countries and national and regional registries intended for international use. The field of application includes but is not limited to · collection management systems and digital repositories, · discovery services, including catalogues and indexes, federated metadata repositories and metasearch portals, · delivery services, including persistent identifier management and resolution, access management and interlending services, · reference services including reference management systems and virtual reference services, and · the registry services themselves, of all types, needed to support the above applications. It is anticipated that different registry applications will be based on profiles of this International Standard. The profiles will specify the objects in the information model and the data elements essential to that registry type, and define and maintain the enumerated lists appropriate to the application. The profile will also specify the bindings and protocols to be used for exchange purposes. This will enable parties in the same sector and in parallel sectors to collaborate in the development and delivery of services and content.