Which entity is primarily involved in defining preservation metadata standards?

The Society of American Archivists (SAA) is a key entity in the field of archival science, including the development of standards for preservation metadata. The SAA has been influential in establishing best practices, guidelines, and standards that archivists use to manage and preserve digital records. This includes definitions and frameworks related to preservation metadata, which is essential for ensuring the long-term usability and accessibility of digital resources.

Preservation metadata provides critical information about the management of digital objects over time, helping to track their provenance, authenticity, and any actions taken to preserve or maintain them. The SAA’s involvement emphasizes a focus on professional standards within the archival community, ensuring that preservation practices are in line with the needs of archivists and the institutions they serve.

In contrast, while other organizations mentioned may contribute to the conversation surrounding preservation metadata or play a role in broader library and archival standards, the SAA's specific focus on archival practices and their development makes it the primary body for defining these standards.