IFLA Library Reference Model

Entities and relationships in the IFLA LRM.

The IFLA Library Reference Model (IFLA LRM) is a conceptual entity–relationship model developed by the International Federation of Library Associations and Institutions (IFLA) that expresses the "logical structure of bibliographic information". It unifies the models of Functional Requirements for Bibliographic Records (FRBR), Functional Requirements for Authority Data (FRAD) and Functional Requirements for Subject Authority Data (FRSAD).[1] The IFLA LRM is intended to be used as the basis of cataloguing rules and implementing bibliographic information systems.[2] It has Library of Congress subject heading number 2017004509.[3]

## Contents

* 1 Differences from FR-series models
* 2 See also
* 3 Notes
* 4 References
* 5 Further reading

## Differences from FR-series models

IFLA LRM adds super-classes res ("thing") and agent to facilitate formal relationship definitions.[4] Time span and place are entities rather than literal values.

It uses the same Work, Expression, Manifestation, Item (WEMI) model as FRBR Group 1 entities. The FRBR Group 2 corporate body and FRAD family are combined into a single collective agent type. FRBR Group 3 entities are deprecated. A redefined nomen type encompasses name from FRAD plus nomen, identifier, and controlled access point from FRSAD.[4]

## See also

* Resource Description and Access (RDA)
* FRBRoo
* CIDOC Conceptual Reference Model
* BIBFRAME

## Notes

1. ↑ Riva, Le Bœuf & Žumer 2017, pp. 5, 9.
2. ↑ LSIT 2020, section "How is IFLA LRM used?"
3. ↑ LCSH 2017.
4. ↑ 4.0 4.1 IFLA 2016, p. 1.

## References

* IFLA (2016). "Overview of differences between IFLA LRM and the FRBR-FRAD-FRSAD models". https://www.ifla.org/files/assets/cataloguing/frbr-lrm/transitionmapping_overview_20161207.pdf.
* "IFLA Library Reference Model (LRM)". 2020. https://www.librarianshipstudies.com/2020/04/ifla-library-reference-model-lrm.html.
* "Subject heading 2017004509: IFLA Library Reference Model". 2017. https://id.loc.gov/authorities/subjects/sh2017004509.html.
* Riva, Pat; Le Bœuf, Patrick; Žumer, Maja (August 2017). "IFLA Library Reference Model: A Conceptual Model for Bibliographic Information". International Federation of Library Associations and Institutions. https://www.ifla.org/files/assets/cataloguing/frbr-lrm/ifla-lrm-august-2017.pdf.

## Further reading

* Dousa, Thomas M.. "The IFLA LRM Model: An introduction". http://downloads.alcts.ala.org/ce/The_IFLA_LRM_Model_Slides.pdf.
* Dunsire, Gordon (August 2018). "Introducing IFLA-LRM". https://www.nla.gov.au/sites/default/files/acoc/acoc_2018_introducing_lrm_0.pptx.
* Oliver, Chris, IFLA Library Reference Model: What and why?, RDA Steering Committee, http://www.rda-rsc.org/sites/all/files/IFLA LRM what and why.pdf

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