The notation introduces a separation between elements of a triple: a single atom and a two-atom tuple-for example, in P-OS, P is a single atom and OS is a two-atom tuple. The system uses four different index orders: S-PO, P-SO, P-OS, and O-PS. The AWETO system (hash-based two-tier RDF storage) ( Pu et al., 2011) is one of those stores and uses Tokyo Cabinet (an open-source key-value store) as the B+tree implementation of the different indexes. As such, it is not a surprise to struggle to find RDF stores based on these systems. ![]() ![]() The popular key-value store systems, such as Redis, Riak, DynamoDB, and Aerospike, are using a data model that seems too simple to address the issues associated to the RDF data model. ![]() In RDF Database Systems, 2015 5.3.3.1 Key-value store
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