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WorldCat Validation release notes and known issues

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Find WorldCat Validation release notes and known issues. Release notes are documents that contain information about new product features and enhancements as installed in scheduled releases.

WorldCat Validation release notes provide current OCLC-MARC Updates; changes to tagging conventions and coding practices for Bibliographic, Authority, and Holdings records; and new MARC codes. To see past OCLC-MARC Updates, see Technical Bulletins.