PBCore is organized as a set of specified fields that can be used in database applications, and it can be used as a data model for media cataloging and asset management systems.
1.0 – April 2005 PBCore Version 1.0 defined 48 metadata elements which combined to describe a media asset or resource's intellectual content, creation, creators, usage, permissions, constraints, use obligations, and its form or format in the physical or digital realm.
1.2.1 – December 2008 PBCore version 1.2.1 was published to better accommodate the possibility that a media asset may have multiple instantiations with various technical attributes.
1.3 – August 2010 PBCore version 1.3 added a new top-level element, a new attribute of string values, and removed the previous requirement to describe one or more instantiations of any asset.
[1] PBCore extends Dublin Core by adding a number of elements specific to audiovisual (AV) assets.