Hello Annette,

To be clear, relationship designators are not core/required by RDA.  However, the Program for Cooperative Cataloging strongly encourages using them when you know what the relationship is.

The relationship designators are intended to make the authorized access points more like the RDF triples of the Semanitc Web.  We have to make these relationships explicit for machine manipulation, otherwise the machines won't be able to parse out what the relationships are between entities.  It helps to think of the access points as discrete data elements that can be utilized by search software, rather than a part of a catalog record being read by a human in its entity.


On Wed, Aug 27, 2014 at 8:35 AM, Annette Ingram <[log in to unmask]> wrote:
Dear Robert

Thank you for your reply. Just one question. You say that if the MARC 1XX is not a creator, a relator designation is optional. But what if the 1XX is a creator (like the author of a book). Is the relator designation compulsory then?