Extensible Metadata Platform

Extensible Metadata Platform
Name	Extensible Metadata Platform
Developer	Adobe Systems
Released	2001
Programming language	XML
Operating system	Cross-platform
Genre	Metadata framework
License	Proprietary / Open specifications

Extensible Metadata Platform is a metadata framework designed to standardize the creation, processing, and interchange of metadata across digital assets. It defines a data model, a serialization based on XML, and mechanisms for embedding metadata into file formats used by creators, publishers, and archivists. The specification aims to bridge workflows in[citation needed] creative industries such as publishing, photography, and broadcasting.

Overview

The framework provides a structured model for expressing descriptive, administrative, and technical annotations about resources used by organizations like Adobe Systems, Library of Congress, ISO, Getty Research Institute, and British Library. It leverages technologies associated with XML Schema, RDF, and namespaces used in contexts including Dublin Core, IPTC, and EXIF. Implementers include software vendors, archival institutions, and media companies such as Google, Microsoft, Apple Inc., Canon Inc., and Sony Corporation.

History

Work began in the late 1990s within companies and standards bodies including Adobe Systems and organizations such as World Wide Web Consortium and ISO. Early adopters were firms in the publishing and photography sectors like Condé Nast, Time Inc., Associated Press, and Reuters. The model evolved alongside related efforts such as Dublin Core, MPEG, and XMP Rights Management initiatives. Over time, influence spread to projects at Library of Congress and digital preservation programs at institutions including National Archives and Records Administration and Smithsonian Institution.

Architecture and Specifications

The architecture is centered on an extensible data model serialized using XML with defined namespaces, allowing integration with vocabularies like Dublin Core, IPTC, EXIF, XMP Rights Management, and custom schemas created by companies such as Adobe Systems. The specification references technologies from W3C such as XML Schema, RDF, and namespace mechanisms used in standards like ISO 32000 (for PDF). Schema validation, canonicalization, and packet structures are part of the formal specifications relied upon by vendors including Microsoft and Apple Inc. for interoperability.

File Formats and Embedding Methods

The framework defines embedding techniques for file formats widely used by vendors like Adobe Systems (for PDF and PSD), camera manufacturers such as Canon Inc., Nikon Corporation, and Sony Corporation (for RAW formats), and image formats standardized by organizations like JPEG Committee and Exif Working Group. Embedding methods include sidecar files used by applications like Adobe Lightroom, inline packets inside formats conforming to ISO standards, and containerized approaches used in multimedia standards such as MPEG-4 and Matroska. Tools from FFmpeg and libraries maintained by projects at Apache Software Foundation implement parsers and writers for many formats.

Core Features and Schema Languages

Core features include namespace extensibility, schema mapping to vocabularies such as Dublin Core, machine-readable property descriptions aligned with RDF concepts, and interoperability hooks used by content management systems like Drupal and WordPress. Schema languages referenced in implementations include XML Schema, RDF Schema, and application profiles employed by institutions such as Getty Research Institute and Europeana. Proprietary and open extensions have been produced by entities like Adobe Systems, Microsoft, and research groups at MIT and Stanford University.

Implementations and Tooling

Implementations appear in commercial software from Adobe Systems (creative suite), enterprise platforms by Microsoft (Office), and open-source projects at Apache Software Foundation and GNOME. Utilities and libraries exist in languages and ecosystems maintained by organizations like Google (Protocol Buffers interop), Mozilla Foundation (Firefox integrations), and academic projects at University of California, Berkeley and Carnegie Mellon University. Metadata editors and batch processors are distributed by vendors such as ExifTool authors, Extensible Software Inc.-style firms, and open repositories on platforms like GitHub.

Use Cases and Applications

The framework is used for rights management in workflows at Walt Disney Company and BBC, asset tracking in photo agencies like Getty Images and Associated Press, preservation metadata in archives such as Library of Congress and National Archives and Records Administration, and search optimization in services run by Google and Bing. Broadcasters like BBC and CNN embed descriptive metadata for playout systems; museums and cultural heritage projects coordinated by Europeana and Digital Public Library of America employ profiles for aggregation.

Privacy, Security, and Interoperability Considerations

Privacy and security concerns are addressed by practices adopted by companies including Adobe Systems, Apple Inc., and Microsoft: developers consider sensitive fields, redaction workflows, and consent requirements arising in jurisdictions governed by laws such as General Data Protection Regulation and statutes enforced by bodies like Federal Trade Commission. Interoperability work involves liaison with standards bodies including W3C, ISO, International Press Telecommunications Council and consortiums like Open Geospatial Consortium to align vocabularies and ensure that embeddings in formats such as PDF and JPEG remain robust across platforms from vendors like Canon Inc. and Sony Corporation.

Category:Metadata