Following is a list of changes from BIBFRAME 1.0 to 2.0. These are the more significant changes; the list is not intended to be exhaustive.
- Elimination of Authority class. Persons, organizations, places (things with names) are represented as real world objects rather than identified by name.
- Elimination of Annotation class. Things that were annotations in 1.0, e.g. tableOfContents, are now properties.
- Introduction of items. Class bf:Item is introduced for items (which were represented as annotations in 1.0).
- Introduction of events. Class bf:Event is introduced. See //www.loc.gov/bibframe/docs/pdf/bf2-eventmodel-march2017.pdf (PDF, 892 KB).
- Remodeling of titles. See //www.loc.gov/bibframe/docs/pdf/bf2-titles-march2017.pdf (PDF, 195 KB). Most notably, classes WorkTitle and InstanceTitle are removed (merged into bf:Title).
- Remodeling of identifiers. See //www.loc.gov/bibframe/docs/pdf/bf2-identifiers-march2017.pdf (PDF, 192 KB). Most notably, identifier types are distinguished by class rather than property. (1.0 had many identifier properties and a single identifier class. 2.0 has a single identifier property and many identifier classes.)
- Remodeling of notes. See //www.loc.gov/bibframe/docs/pdf/bf2-notes-march2017.pdf (PDF, 136 KB)
- Remodeling of roles. See //www.loc.gov/bibframe/docs/pdf/bf2-roles-march2017.pdf (PDF, 89 KB)
Class bf:Contribution is introduced which pairs agents and roles.
- Ontology. BIBFRAME 2.0 is formally expressed as an OWL rather than an RDFS ontology. Many properties are now defined as object properties. Several properties now have inverses defined.
- Addition of several properties and classes to support better alignment with cataloging norms.