The NCIMetathesaurus (NCIm)

geographical subdivision is no longer supported since the use of faceting through discovery layers is an assumed part of a linked data future. All these changes will naturally warrant a large amount of database maintenance for both the larger cataloging utilities such as OCLC and the smaller local library systems. These changes were announced on March 6, 2023, in an official RBMS CVRMC launch e-mail sent out to several listservs by the co-chairs of the RBMS Controlled Vocabularies Editorial Group. The editorial group clearly are aware of the impact the changes will have on discovery in online library catalogs and in that e-mail stated, “We are in the process of creating a crosswalk spreadsheet for use in bibliographic file maintenance, and we will make an announcement once it is available.” Still the bulk of the clean-up will have to be done (or paid for) by individual libraries and may be burdensome to smaller or less well funded libraries. Not to be disregarded on the main search page is a very important (and easily overlooked) link to the prefatory material, RBMS CVRMC Introduction (https:// docs.google.com/document/d/1kpKLgtHLXy1nlkC-cuLAjzcbuDW5qy_czlyT0kXsQtk /edit). Here are given the application instructions, guiding principles, historical practices, and a bias statement. There is so much of importance in this document, particularly in terms of the changes in the application of the terms, that its link should be made more prominent on the Library of Congress search page for RBMS CVRMC. Regardless of the hidden introduction link, the search site for the RBMS Controlled Vocabularies combined as such is a huge improvement over the previous search site and the changes in the application of the RBMS Controlled Vocabularies terms are reasonable considering contemporary discovery layers and the foreseeable future of a linked data environment. Rating: 5 out of 5