AVIF Metadata Standards for Institutional Archiving

Archiving institutional collections in the AV1 Image File Format (AVIF) requires robust metadata strategies to ensure long-term preservation, discoverability, provenance, and interoperability. Because AVIF is derived from the High Efficiency Image File Format (HEIF) and the ISO Base Media File Format (ISOBMFF), it natively supports embedded metadata payloads. This article outlines the recommended metadata standards for archiving cultural heritage and institutional assets in AVIF, focusing on XMP, Dublin Core, PREMIS, IPTC, and Exif.

The AVIF Container and Metadata Capabilities

AVIF stores image items and metadata within standard ISOBMFF boxes. For preservation purposes, AVIF files accommodate standard item types for metadata payloads, notably:

Because institutional repositories rely on standardized extraction tools, adhering to well-defined container payload conventions ensures that embedded metadata remains parsable across format migrations and software transitions.

1. Extensible Metadata Platform (XMP)

XMP is the primary recommended carrier for descriptive, administrative, and rights metadata within AVIF files. Standardized under ISO 16684-1, XMP uses RDF/XML to serialize complex, extensible data structures. It allows institutions to embed multiple specialized schemas within a single, unified stream inside the AVIF mime box without data collisions.

2. Dublin Core (DCMI) via XMP

For descriptive cataloging, the Dublin Core Metadata Element Set (ISO 15836) embedded within XMP is the baseline standard for institutional archives. It standardizes essential fields such as:

Dublin Core ensures that the digital asset can be ingested into federated discovery systems, library catalogs, and open-access networks.

3. PREMIS (Preservation Metadata: Implementation Strategies)

PREMIS is the international standard for preservation metadata, documenting digital provenance, authenticity, and preservation events. While full PREMIS records often reside in external repository management systems or METS (Metadata Encoding and Transmission Standard) wrappers, key PREMIS elements should be mirrored in the embedded XMP container, including:

4. IPTC Photo Metadata Standard

The IPTC (International Press Telecommunications Council) standard maps directly to XMP and is recommended for administrative and legal rights tracking. For institutional repositories, IPTC provides precise fields for:

5. Exif (Exchangeable Image File Format)

Exif remains the standard for capturing technical, hardware-level metadata at the moment of digitization. For AVIF archives, Exif should be retained in the dedicated Exif box to record:

Best Practices for Institutional Implementation

  1. UTF-8 Encoding: Ensure all XMP and descriptive string entries use UTF-8 character encoding to prevent character corruption during ingest.
  2. Metadata Synchronization: Prevent discrepancies between Exif and XMP. When both standards hold overlapping data (such as creation dates), the XMP Dublin Core entry should be treated as the authoritative institutional record.
  3. Hybrid Architecture: While embedded metadata within AVIF ensures self-documentation if an asset is separated from its host system, institutions should maintain synchronized external XML manifests (such as METS or MODS) in their digital asset management system (DAMS).