WorldCat Metadata API available on the OCLC WorldShare Platform.
OCLC member libraries can use the WorldCat Metadata API to conveniently add and enrich WorldCat records and to maintain WorldCat holdings information and local bibliographic data. Libraries can now create new applications using the WorldCat Metadata API to manage their cataloging workflows. As always, libraries can continue to catalog their collections in WorldCat using OCLC-built applications, such as Connexion and the upcoming WorldShare Metadata Record Manager. However, it's pretty exciting that the WorldCat Metadata API enables libraries to manage WorldCat data through integration with library- and partner-built applications.