ResourceSync, a specification which describes a synchronization framework for the web consisting of various capabilities that allow third party systems to remain synchronized with a server's evolving resources, was first published in 2014 and updated more recently in 2017 as ANSI/NISO Z39.99-2017. The problem that ResourceSync was designed to solve spans the areas of search, discovery, deposit, metadata harvesting, and transfer; there is a need to keep collections of resources in sync so that additions, updates, and deletions of one are reflected in the other. The ResourceSync standard was written in such a way that individual capabilities could be combined to meet local requirements. A server may also describe synchronization capabilities that it supports and means through which third party systems may discover this support. The core functionality of the specification is intended to represent a functional replacement of OAI-PMH. (Other features, such as change notification, framework notification, and archive capabilities are published through separate documents, not currently part of the material part of NISO/ANSI standardization.)
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