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LRM Entity-Relationship Model

IFLA LRM is a high-level conceptual reference model developed by the International Federation of Library Associations and Institutions.

Overview​

The IFLA Library Reference Model (LRM) consolidates three previously separate IFLA conceptual models:

  • FRBR (Functional Requirements for Bibliographic Records)
  • FRAD (Functional Requirements for Authority Data)
  • FRSAD (Functional Requirements for Subject Authority Data)

The consolidation was designed to:

  • Resolve inconsistencies between the three separate models
  • Create a single, streamlined, and logically consistent model
  • Support use in linked data environments

Model Development​

The development process involved examining every user task, entity, attribute and relationship from the original models. Definitions were revised and remodeled as needed to create a comprehensive approach to bibliographic data representation.

The model brings bibliographic data modeling up-to-date with current conceptual modeling practices while maintaining compatibility with linked data environments.

Technical Details​

  • Total Elements: 117
  • Namespace: http://iflastandards.info/ns/lrm/lrmer/
  • Suggested Prefix: lrmer

Elements Structure​

The LRM model consists of:

Entities​

Documentation of LRM entities is currently being developed.

Attributes​

Documentation of LRM attributes is currently being developed.

Relationships​

Documentation of LRM relationships is currently being developed.

Further Information​

For complete element definitions and implementation guidelines, please refer to the official IFLA LRM documentation.

This page is under development. The complete element reference will be available soon.