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Content repository API for Java
Content Repository API for Java (JCR) is a specification for a Java platform application programming interface (API) to access content repositories in a uniform manner.〔(Java API for XML Registries ) - Another Java API for Registries and Repositories〕 The content repositories are used in content management systems to keep the content data and also the metadata used in content management systems (CMS) such as versioning metadata. The specification was developed under the Java Community Process as JSR-170 (Version 1),〔(JSR-170 )〕〔(JSR-170 (HTML version of the specification) )〕 and as JSR-283 (version 2).〔(JSR-283 )〕 The main Java package is javax.jcr.
== Overview ==
A JCR is a type of object database tailored to storing, searching, and retrieving hierarchical data. The JCR API grew out of the needs of content management systems, which require storing documents and other binary objects with associated metadata; however, the API is applicable to many additional types of applications. In addition to object storage, the JCR provides: APIs for versioning of data; transactions; observation of changes in data; and import or export of data to XML in a standard way.
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