Jackrabbit at gos.i
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Jackrabbit

The Apache Jackrabbit™ content repository is a fully conforming implementation of the Content Repository for Java Technology API (JCR, specified in JSR 170 and 283).

A content repository is a hierarchical content store with support for structured and unstructured content, full text search, versioning, transactions, observation, and more.

Apache Jackrabbit is a project of the Apache Software Foundation.