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h1. GraphDB Interoperability and Architecture
OWLIM GraphDB version 3.X 6 is packaged as a Storage and Inference Layer (SAIL) for Sesame version 2.x and makes extensive use of the features and infrastructure of Sesame, especially the RDF model, RDF parsers and query engines.
Inference is performed by the TRREE engine \[39\], where the explicit and inferred statements are stored in highly-optimised data structures that are kept in-memory for query evaluation and further inference. The inferred closure is updated through inference at the end of each transaction that modifies the repository.