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A JCR can export portions of its tree to XML in two standard formats and can import hierarchies directly from XML. JSR 283 compliant implementations must support a standardized form of SQL for queries and a query object model QOM. JSR 283 deprecates the XPath query language defined in JSR 170. The Apache Jackrabbit reference implementation of JCR also supports the integration of the Apache Lucene search engine to give full text searches of data in the repository.